My twin boys are 10 weeks old. One of them has his legs as the frog legs position. Till what age must I consider this a normal issue? or is it abnormal already? I thought it was normal that I hadn't asked his ped yet.
According to the International Hip Dysplasia Institute, it can take "several months", and Babycenter.com says it can take "6 months" for the legs to straighten out. While I hardly consider those sites as clear experts on this issue (the articles weren't written to specifically address your question), they do seem to indicate that it is normal for a 10 week old baby to not keep his legs straight.
That being said, one cannot rule out the possibility of a medical condition. According to the American Academy of Orthopedic Surgeons, if your baby has developmental dislocation of the hip, it is best for him to be treated early. I'd recommend asking your pediatrician if you are worried.