Getting too buff for my jammies

So, after a week of 100+ temps, and having Enzo sleeping in a t-shirt and diaper (and his Swaddle Me cotton blanket, of course!), we attempted to get him back into his jammies since it was cooling down a bit. Uh, no. He's about 3 inches too tall and about 2 inches too wide for his "newborn" nightie. As you can see, E thought this was hilarious. Note the mini jammies being dwarfed by his buffness.