With the cold months coming these two things are great!

These definitely could be ordered a size up. My daughter is on the smaller size (she's 8.5 months) and the 6-12 size is almost too small. But they're pretty thick and good quality! They're good for under pants or a sleeper as well. Plus you don't have to mess with socks

These boots are also great! They're very warm, have grip on the bottom, easy to put on, and they stay on! I would order 2 sizes up though