Your friend said: "Omg!! Did you see what Lisa shared on Insta? Her cat had 3 kittens - the little ones look sooo cute. I want a cat too :(((." So, Lisa's cat had **3 babies** (Junge = kittens in this context). If you want to congratulate your friend, you could say something like: "Herzlichen Glückwunsch zu den 3 süßen Katzenbabys! Sie sehen wirklich unglaublich süß aus!" Let me know if you want help with a message!