When my bub was three months old, she slept in

- cotton singlet or envelope neck tee (breathable and comfy)
- night nappy with MM windpro cover (so waterproof)
- baby legwarmers if needed e.g huggaluggs cotton ones (now you can get bamboo ones too)
- wrapped up in a muslin wrap
- on cotton sheets

when i checked on her, i would place my palm on her forehead, fingers and toes, to make sure she was an ok temperature. (that's what my midwife advised, how to check).

i did try polar fleece sleeping bags in winter and my baby sweated SO badly, within minutes of having it on, i had to ditch that idea.

i didn't know about all cotton baby sleeping bags back then, if i had, i would have bought a sleeveless cotton one for her to sleep in for summer. you can get the exxy grobag types or the cheapo bestnless/big w type.

i also didn't know about brollysheets back then. if i had another small baby, i would have a brollysheet on MY bed, so when we were feeding in bed, having a sleep together, any spills, the brollysheet would save me having to strip my bed each time. i got the brollysheets for toilet training stage, but now i think about it, they would have been useful from birth (but on MY bed).