Sleeping recommendations (blanket)

Hello all.

My baby is 6 weeks old and she’s always cold, barely sleeping in her bassinet bc of this. During the day she sleeps well because I put a blanket on her (in watching her). During the night, I don’t as I know it’s a huge SIDS risk.

She currently sleeps with a onesie, a regular cotton pajama and a carter cotton long sleep sack. She’s still cold. My house is kept 67-71 degrees.

Any recommendations for what to put on her that’s warmer? I have also tried to add another layer (another onesie) but it’s just so uncomfortable with so many layers.

TIA

Thanks