Pockets

Why do infant and toddler clothes have pockets? It must be costly to add these adornments (for that is what they are) to the clothing---for what? I think Kingsley used and discovered pockets for the first time this past month (he is 2 1/2 years old). Maybe it is for us---the Moms. Just like all of those cute newborn onesies that say "I Love Mummy", etc. Clothes to put our lovely babies in and while we enjoy the colicky drama, we can look at our baby's chest and say---Oh, you do love your "Mummy" don't you? Makes us feel better, we think its cute. Other than that, I really don't know.