my LO is 7 mths+. can sit unsupported though a little unsteady and loves to babble all day long. however he is not very active; hardly plays with his toys when they r placed in front of him and seems to not be very curious about his surroundings. he does not reach out for things when i offer them to him. should i be worried? what can i do to help him in his development? i know babies develop at their own rate but would like to know if this is cause for concern. FTM here.