My 7 month old is able to sit, and does for brief periods of time. But it seems like he has no incentive to sit. He soon falls on his stomach to crawl, or if there are things nearby, pulls himself up to stand. He loves to stand, and crawling gets him places. Sitting apparently does nothing for him.
Is sitting a mandatory part of development? Will not learning to sit properly affect his muscles or balance (or anything else) in any way? If so, how do we incentivise him to sit without almost immediately falling on his stomach or back? We don't have any toys which can only be played with while sitting. Lying down on tummy works just as well. So I'm looking for suggestions for such toys too.
P.S : We bought him a high chair when he turned 6 months old to feed him, and he sits up straight in it. But he probably has support on all sides and isn't actually sitting using his own muscles and balance.