Hello there I haven’t been sleeping so well cuz I’m so worried about my 3month babies temperature at night… so worried about overheating, but then he seems restless when I dress him in less warm things. Tonight I have him in the a cotton onsie, and the halo 1.5tog swaddle and room temp is 22/23degrees is that too cold? he is moving SO much and I found him lying across the cot Do you think he needs another layer on? Why would he be moving so much?? Totally understand if you don’t know The alternate is having room 21degreea and him in a cotton onsie and a 3.0tog swaddle but I am so scared of overheating??

It can be difficult to work out what may be the most appropriate clothing/bedding for baby when sleeping.
Red Nose recommends dressing baby according to the room temperature, rather than trying to modify the room temperature with heating or cooling.

I wish I could give you some specific guidance for dressing your baby, but every baby is different.
Red Nose has the following general information.

“Dress baby and use layers as you would dress or use layers yourself: to be comfortable, neither too hot nor too cold.

Dress baby for sleep and add/remove lightweight blankets to ensure baby’s back or tummy feels comfortably warm to the touch.
Remove hats, bonnets, beanies and hooded clothing from baby’s head as soon as baby is indoors.  - Always sleep baby with head & face uncovered.

A good way to check baby’s temperature is to feel baby’s back or tummy (don’t worry if baby’s hands and feet feel cool - this is normal).
Whether the baby has a cold or infection or another special need.

Consider how many layers that you as the baby’s carer are wearing comfortably.”

https://rednose.org.au/article/bedding-amount-recommended-for-safe-sleep

“As long as baby is put down to sleep on their back, and that baby is dressed appropriately for the room temperature – not overdressed or under dressed – with their head and face uncovered, you can feel reassured that you are protecting baby from overheating.

We don’t believe that it’s necessary to use a room temperature monitor, or to leave the heating or cooling on all night, as long as baby is dressed appropriately for the temperature of the room – not too hot, not too cold.”
https://rednose.org.au/article/how-to-dress-baby-for-sleep

Is your baby sleeping ok?
He may be moving around a lot trying to get his arms free.

At 3 months, many babies are getting ready to roll.
You could try him without his swaddle, so he is arms free.
https://rednose.org.au/article/is-it-safe-to-wrap-swaddle-my-baby