DS. Is 9 months now and into everything! Crawling everywhere, putting everything in his mouth, opening drawers and cupboards etc. We are just cutting tooth #5 (and possibly 6!). He says Mum and Dad. He just got given Rhino brace for mild hip dysplasia that they've been keeping an eye on. He has it until January. My DD had the same but hers was 3-6mo. He is crawling around just as easily and eagerly as before.