Who is responsible for these sleeves?

I've now changed young Throckmorton at least 45 times. Fortunately, some enterprising soul stitched in a set of buttons at the bottom of these onesies (I can't stand that name either), so I don't have to actually try to get the damn things over the boy's head every time he smiles widely and thus shits. But, occasionally these second-world nappies do leak and therefore I have to change the stripped, starry, or polka-dotted outfits.

Now, these onesie genies apparently have the commonsense to ensure that the neck widens enough to allow a disproportionately large head to fit through. Smart. But, these same masterminds don't seem to realize that the sleeves would be a tad more, shall we say, user-friendly, if their circumference was more than 2.5 centimeters. Dicks. How the hell does one pull a sleeping baby's arms through a two-inch long tube with a circumference no less than .025 centimeters larger than the elbow? I ask you. Or perhaps my boy just has a set of guns...