We love perlimpinpin! They are warm but not too warm, my daughter uses it even in the summer. They are quite long and my daughter is very mobile. She is almost 8 months and still wearing the 0-6 month. Mind you her feet are nearing the end. But I find the bigger it is the more she gets twisted up in it. They are great quality and so soft and cozy. The biggest draw for us is that they zip up at the side, perfect for tummy sleepers!
Highly recommend this product.