First clothing purchase for my little Monkey

I had to run to the mall to get myself some socks so that I don't have to do laundry and stumbled into the baby section. I just love Carter's clothes for babies. I bought this little ensemble... I couldn't resist. I bought a newborn size so hopefully he won't be too big for it. I learned my lesson with Claire. I didn't come prepared with any newborn clothes. I figured 0-3 months would be okay, but she was swimming in everything we had. I wonder if he will he be another tiny baby? The pants already might be too short for him, we'll see. Do baby sizes come in talls?