"Everyone looks pretty grown-up after summer break"
Shinpachi finds himself in stuck in a completely different world.  That is when the Shinsengumi sends a berserk Yamazaki to pick up the bewildered Shinpachi.
Oh, he's a newborn, so you'll need to support his head.
Oh, es recién nacido, así que deberás sostenerle la cabeza.
Ah, é um recém-nascido, então 
é preciso apoiar a cabeça.