sure, according to piaget infants are learning mostly through their own bodies. but parent interaction might play a role in temperment or even attitude. mom and dad provide the bottle or binky to suck on, mom and dad praise them when they do something cute like kick their feet and giggle. i think that if ignored, the progression of piagets stages would continue but possibly the child would not have the same ideas about the world around them as a child whos parents gave them attention and praise