Can you try putting him in just a diaper and then swaddle? If I was sleeping in nothing but my underwear, I wouldn't be too hot with just one blanket, even if it was 74.
Could you turn down the temp or put a fan in her room? In the summer we have the temp set at about 72 and sleep with a sheet, so I'd think she'd be okay with just a diaper and a cotton swaddle. Have you tried the Halo cotton swaddles? We really like those in our house!
Re: Am I asking for a long night?
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