Based on the Filipino (Tagalog) sentence your friend said: "Ang pusa ko ay kakapanganak lang nang limang kuting." This translates to: "My cat just gave birth to five kittens." So, your friend's cat just had 5 kittens. If you're congratulating your friend, you can say something like: "Congratulations on the new kittens! Your cat just gave birth to five beautiful babies. That's wonderful!"