# BabyData pregnancy calculators (remote · babydata.co.uk)

UK due date, ovulation, pregnancy weeks and maternity pay calculators. Not medical advice.

- Trust score: 69/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `babydata.co.uk`: 69/100 (this document), [markdown](https://verifymcp.io/servers/uk-co-babydata-pregnancy-calculators/babydata.md), [page](https://verifymcp.io/servers/uk-co-babydata-pregnancy-calculators/babydata)

## Channel facts

- Endpoint: `https://babydata.co.uk/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.1`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-11-05.

- **Endpoint Security**: 57/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 4 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS is enforced; there's no plaintext access path.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 82/100
  - 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 591 tokens (~98/item across 6 items; 4 tools + 2 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 50/100
  - Stability observed for 15 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 75/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - 0 of 1 tool(s) whose name or description implies an irreversible operation declare an MCP destructiveHint annotation; "maternity_pay" implies "pay" and declares no destructiveHint at all, which the MCP spec reads as destructive by default.
  - An AI judge read all 6 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 60/100
  - Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28.

## Install

### How do I install the BabyData pregnancy calculators MCP server?

BabyData pregnancy calculators is a hosted endpoint at https://babydata.co.uk/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http uk-co-babydata-pregnancy-calculators 'https://babydata.co.uk/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "uk-co-babydata-pregnancy-calculators": {
      "url": "https://babydata.co.uk/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "uk-co-babydata-pregnancy-calculators": {
      "type": "http",
      "url": "https://babydata.co.uk/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.uk-co-babydata-pregnancy-calculators]
url = "https://babydata.co.uk/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "uk-co-babydata-pregnancy-calculators": {
      "type": "remote",
      "url": "https://babydata.co.uk/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add uk-co-babydata-pregnancy-calculators --url 'https://babydata.co.uk/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  uk-co-babydata-pregnancy-calculators:
    url: "https://babydata.co.uk/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "uk-co-babydata-pregnancy-calculators": {
      "Transport": "http",
      "Url": "https://babydata.co.uk/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add uk-co-babydata-pregnancy-calculators -t streamable-http -u 'https://babydata.co.uk/mcp'
```

### Other

```json
{
  "mcpServers": {
    "uk-co-babydata-pregnancy-calculators": {
      "type": "http",
      "url": "https://babydata.co.uk/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-11-04 (score 69, +1)

No change was recorded against any check on this day. Stability & Change Management went from 43 to 47. That category is still filling its 30-day observation window: 13 days of observed history at the previous scan, 14 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-01 (score 68, +1)

No change was recorded against any check on this day. Stability & Change Management went from 33 to 37. That category is still filling its 30-day observation window: 10 days of observed history at the previous scan, 11 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-30 (score 67, +1)

No change was recorded against any check on this day. Stability & Change Management went from 27 to 30. That category is still filling its 30-day observation window: 8 days of observed history at the previous scan, 9 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-28 (score 66, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-26 (score 65, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-24 (score 64, +1)

No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-22 (score 63, +1)

- [functional improvement] Stability: unverified → 0.03

### 2026-10-21 (score 62)

First indexed and scored.

## MCP tools (4)

### `calculate_due_date` (~154 tokens)

Estimate a pregnancy due date and current stage using Naegele's rule, from the last menstrual period (LMP), conception date, or an IVF embryo-transfer date. Returns the estimated due date, weeks pregnant now, trimester and weeks remaining. Informational only, not medical advice.

Input parameters:

- `asOf` (string): Reference date YYYY-MM-DD for "weeks pregnant now" (default today).
- `date` (string, required): The relevant date as YYYY-MM-DD: LMP, conception, or IVF transfer date.
- `embryoAge` (number): Embryo age in days at IVF transfer (commonly 3 or 5; default 5).
- `method` (string): Dating method (default lmp).

### `calculate_ovulation` (~82 tokens)

Estimate the likely ovulation day, the fertile window and the next period from the first day of the last period and the average cycle length. Informational only.

Input parameters:

- `cycleLength` (number): Average cycle length in days, 20 to 45 (default 28).
- `lastPeriod` (string, required): First day of last period as YYYY-MM-DD.

### `pregnancy_weeks` (~108 tokens)

Work out how many weeks and days pregnant someone is, the trimester and progress through the 40 weeks, from either the LMP or the due date. Informational only, not medical advice.

Input parameters:

- `asOf` (string): Reference date YYYY-MM-DD (default today).
- `dueDate` (string): Due date as YYYY-MM-DD (LMP is worked back as dueDate minus 280 days).
- `lmp` (string): First day of last period as YYYY-MM-DD.

### `maternity_pay` (~115 tokens)

Estimate UK Statutory Maternity Pay over the 39 weeks under gov.uk rules: 90% of average weekly earnings for 6 weeks, then the lower of the statutory flat rate or 90%. Uses the 2026-27 gov.uk flat rate of £194.32 a week, which changes each April. Estimate only, not advice.

Input parameters:

- `annualSalary` (number): Annual salary before tax (GBP), converted at /52.
- `weeklyEarnings` (number): Average weekly earnings before tax (GBP).

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/uk-co-babydata-pregnancy-calculators/babydata#diagnostics

## Score history

- 2026-11-05: 69
- 2026-11-04: 69
- 2026-11-03: 68
- 2026-11-02: 68
- 2026-11-01: 68
- 2026-10-31: 67
- 2026-10-30: 67
- 2026-10-29: 66
- 2026-10-28: 66
- 2026-10-27: 65
- 2026-10-26: 65
- 2026-10-25: 64
- 2026-10-24: 64
- 2026-10-23: 63
- 2026-10-22: 63
- 2026-10-21: 62

## Common questions

### What is the BabyData pregnancy calculators MCP server?

BabyData pregnancy calculators is an MCP server listed in the public MCP registry as uk.co.babydata/pregnancy-calculators. UK due date, ovulation, pregnancy weeks and maternity pay calculators. Not medical advice. This page covers its hosted endpoint (https://babydata.co.uk/mcp).

### Is the BabyData pregnancy calculators MCP server safe to use?

BabyData pregnancy calculators scores 69 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the BabyData pregnancy calculators MCP server expose?

BabyData pregnancy calculators exposes 4 tools: calculate_due_date, calculate_ovulation, pregnancy_weeks, maternity_pay. Their descriptions and schemas cost roughly 459 tokens of context every time the server is loaded.

### Does the BabyData pregnancy calculators MCP server require authentication?

No. We connected to BabyData pregnancy calculators without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the BabyData pregnancy calculators MCP server still maintained?

BabyData pregnancy calculators is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://babydata.co.uk/mcp
- Website: https://babydata.co.uk/api/
- Changelog RSS feed: https://verifymcp.io/servers/uk-co-babydata-pregnancy-calculators/babydata.xml
- Changelog JSON feed: https://verifymcp.io/servers/uk-co-babydata-pregnancy-calculators/babydata.json
- HTML version of this page: https://verifymcp.io/servers/uk-co-babydata-pregnancy-calculators/babydata