Babies that insist upon gaining speed

My darling husband and I have four children, and the newest one, who is only six months old, is already crawling. This sweet little girl has also outgrown clothing between washes. {My laundry piles do sit quite dormant these days, though, and have been known to house a spider or some such creeping creature.} She is getting so round and dimply, and we are enjoying each fleeting day with her.