When you have babies or toddlers, you have to carry stuff. Diapers, wipes, protective barrier creams. Extra set of clothes for when the diaper doesn't hold the runny poop. Plastic bag to put the wet clothes in after you try rinsing the poop out. Mat to change the kid on so the poop can be easily wiped up. Baby socks for when baby's foot ends up in the poop. Plastic bags for baby's dirty diapers.
Baby food. Baby bottles. Containers of formula. baby rice flakes to mix into food. Spoons to feed baby. More plastic bags to put dirty spoons in. Container of Cheerios. Toys for teething baby to soothe gums on. Baby Anbesol for when those little gums hurt. Baby Motrin for when those those little gums hurt. More plastic bags for toys. Baby bibs. Extra baby bibs for when baby rips it off and throws it on the floor while you're scooping more food out. Second extra set of clothes and socks for when baby gets covered in food. Comb or brush to comb baby's hair after you use wipe to get the food out of it.
Baby's blanket or stuffed toy that baby cannot calm self without.
There is a ton of crap that must be carried. Plus a stroller.
And that is why many, many moms cannot wait until the child is three or four years old and Mom can be done carrying all that stuff and hauling the stroller around.
Ten or fifteen years later, she'll be so sorry those days are over and wish she could re-live just one of them...but when it's going on, all Mom wants is for it to end!