# baby-age

Calculates exact baby age, 25 developmental milestone dates, zodiac signs, and birthstones. The MCP server eliminates LLM errors with leap years and month lengths.

- MCP server · `type=mcp` · Claude Code, Codex, Cursor, GitHub Copilot, Windsurf (Devin Desktop), Cline, Zed, Gemini CLI
- Author: babyagecalculator
- License: MIT · policy=link-only · description only; the file stays with the author
- Source: https://github.com/babyagecalculator/ai
- Updated: 2026-10-23
- HTML: https://affpapa.org/en/nevibecode/mcp/baby-age

## What it does

Large language models often stumble when calculating calendar intervals. Leap years and irregular month lengths cause frequent mistakes. This hosted MCP server offloads the calendar math. It accepts a birth date and calculates the baby's exact age, next milestone, zodiac sign, and birthstone guide.

The server provides five tools: `get_baby_age`, `get_milestone_dates`, `list_milestones`, `get_zodiac_sign`, and `get_birthstone`. It can return calendar dates for all 25 milestone types. If an invalid date string is provided, the endpoint returns an HTTP 400 status code with an explanation.

The endpoint is hosted at `https://babyagecalculator.com/api/mcp/`. You do not need to register or manage API keys. All calls run directly over HTTP, so nothing needs to be compiled or run locally.

## Requirements
- Remote server: `https://babyagecalculator.com/api/mcp/`

## Install

### Claude Code (native platform)

**Platform CLI: remote server**
```bash
claude mcp add --transport http baby-age https://babyagecalculator.com/api/mcp/
```

### Codex

**Platform CLI: remote server**
```bash
codex mcp add baby-age --url https://babyagecalculator.com/api/mcp/
```

### Cursor

**Config file**
File `.cursor/mcp.json`:
```json
{
    "mcpServers": {
        "baby-age": {
            "url": "https://babyagecalculator.com/api/mcp/"
        }
    }
}
```

### GitHub Copilot

**Config file**
File `.vscode/mcp.json`:
```json
{
    "servers": {
        "baby-age": {
            "type": "http",
            "url": "https://babyagecalculator.com/api/mcp/"
        }
    }
}
```

### Gemini CLI

**Platform CLI: remote server**
```bash
gemini mcp add -t http baby-age https://babyagecalculator.com/api/mcp/
```

## When to use it
- calculate exact baby age from a birth date
- generate calendar dates for 25 milestones
- identify zodiac signs and birthstones without manual math
- prevent language model errors with leap years and month lengths

## Example prompts
- Calculate the exact age of a baby born on 2024-06-15.
- List the calendar dates for all 25 milestones for birth date 2024-10-01.
- Find the zodiac sign and birthstone details for 2025-02-14.

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