I'd be happy to help you out! It seems your friend is talking about someone named Lisa's cat giving birth to kittens, and not human babies. According to the text, "Ihre Tatze" (which means "her paw" or "her cat" in this context) has given birth to 3 "Junge" (which means "boys" or "male kittens"). So, you can congratulate your friend on the arrival of Lisa's three adorable kittens!