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I think it depends. My husband and I run really hot so our baby does as well, normally if we put her in a warm onesie (fleece or a little bear suit) then I usually put a tank top onesie on her so I can leave the suit open a little for air. If I put her in a cotton one I do the cotton footie with a sleep sack
I would still put the footie and a light sleep sack on ... unless you have a heater on the maybe just sleep sack or footie which ever helps babe get more sleep....