Confining your baby or toddler to a playpen or infant seat for long periods may be delay his development. Infants and toddlers need opportunities to be active so they can learn important developmental skills such as rolling over, crawling and walking.
It’s a sequential process. Babies have to stretch, squirm and twist their bodies in order to develop their muscles. Rolling helps strengthen the muscles they’ll need for sitting up. First a baby rolls, then sits up and finally scoots…all in preparation for crawling.
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This is Parents as Teachers 