It seems like your friend is excited about her friend Lisa's cat having given birth to three kittens, as mentioned on Instagram. Based on the information provided, there are three new babies (kittens) in this context. You can congratulate your friend on her eagerness to have a cat and share in the joy of the new kittens. Here's a suggestion for a congratulatory message: "Wow, that's amazing news! Congratulations to Lisa and her adorable new kittens. I can totally understand why you're feeling that way about wanting a cat too. They are such wonderful companions. Maybe one day you'll have your very own little furball to love and cherish. 🐱❤️"