Warm lining, comfortable
Size: please check the chart in the picture for your reference.
About the size, it's better to measure your baby's feet, and follow the chart instruction in CM.
The best size for your baby would be, her/his feet real size plus 0.5 to 1cm to get the inner /insole size. You want your chidren feet have enough room to grow freely.
Are you still worry about the winter for your baby, here are the shoes you need for your little ones. They are comfortable and warm. These are the best walking shoes.