Positive thoughts are sent to your puppy! Our puppy has had a bum leg on and off since we got her. The vet said it's a passing thing due to growing. It still breaks my heart when she starts to limp and I too think about how awful it would be with a kid.
Best of luck with your baby. I know the bills get high, but they are worth it. We got our little girl pet insurance and it looks like it will be worth it already.
My puppy and kitties are sending her hugs!