They’re just like our quilts, but in sleep bag form. The zipper sits at the bottom when fully zipped and they have a TOG rating of 1.25 - a rating that falls right within a normal range of a babies bedroom temp at night.
0-6mo measurements: 26.5” long, width under armpits 13", at the widest 18.5"
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6-12mo measurements: 28” long, width under armpits 14", at the widest 19"