Serrina provides a smooshy-newborn-dressing tutorial:
Getting newborns dressed quickly is imperative to their happiness. Furthermore, getting shirts/onesies over their heads quickly is even more important. This is what I do: I put my hand down through the neck of the shirt and hold the baby’s head with my left hand. With my right hand, I get the material all ready above his eyes to quickly pull on down around his neck. Once the shirt is around his neck, I cheer and congratulate him on such a good job! Smiles quickly come and he forgets about the old days of being temporarily blinded by a shirt and he no longer fusses with clothing changes!