Based on the information provided, it seems your friend's cat (referred to as "Ihre Tatze" which means "her paw" in German) has given birth to 3 babies or kittens. So the number of new babies your friend's cat has is 3. You can congratulate your friend by saying something like: "Wow, congratulations to Lisa! That's so exciting that her cat had 3 adorable little kittens. They must be so cute! I wish I had a cat too, they sound wonderful."