My friend's son has delayed his milestones. He is two but still not walking yet. He also has a lot of digestive issues and hardly makes eye contact. Could he have autism? I suspect it but I don't want to upset my friend.

Just tell her to have his son checked by a Developmental Pediatric to see if there are any delays. If there's none, then thank God. If there is, then thank God, at least now she knows and appropriate intervention will be done.