My DS was in a sleeping bag at 8 weeks and DD was in a sleeping bag at 3 days old LOL.

Both my babies are tall and kick off their covers.

For DS I transitioned him from being fully wrapped to having one arm out to no arms out. Then I put him in a sleeping bag with a light cotton blanket tucked in tightly over the top to make him feel secure. I started when DS was starting to escape from his wrap, which was at about 6 weeks.

DD - from when she was wrapped up at just a few hours old, she wriggled and carried on and cried and fought the wrap till she had her arms out. I thought she was too young but it was the middle of the night and I wanted to go back to bed so I decided to see how she reacted to the sleeping bag. So I dug it out, put her in it and magic! Asleep in less than 5 minutes. Haven't looked back. She didn't even like having the cotton blanket tucked in around her, she's even more of a wriggler than DS.

I assume your DH is worried about weaning your baby off the sleeping bag. In fact, the sleeping bag for both DS and DD has had a real benefit as a sleep association - they know that sleeping bag means sleep time and they both always immediately snuggled down into it.

When DS moved into a big boy's bed we still put him in a sleeping bag into bed but would just gently suggest every night that he could sleep like a big boy under the covers just like Mummy and Daddy. He was on board with that idea after about a week and only once or twice asked for his sleeping bag on nights when he was overtired, but otherwise it was all gone with no trouble whatsoever.

As you can tell I am a huge fan of the sleeping bag. No dealing with the kicking off of covers.

HTH.

ETA: I use Bubbaroo sleeping bags. I like them because you can get them in plain white which means that they can be handed down to the next bub with no gender colour/picture issues and if there was ever a poo blowout they can be soaked in Napisan without worrying about colours fading. You can now get the Bubbaroos in pale blue, pale pink and mocha if you don't like the plain white. At the time I bought mine they were only available in white but that was a big reason I was sold on them!

They come in a lightweight, mediumweight and heavyweight version. Can't remember the tog number and both DS and DD are asleep so I can't go into their rooms to rummage around. Just google Bubbaroo.

The lightweight ones are plain cotton and great for really hot summer nights. We usually use the mediumweight which are cotton towelling lined and I just change what they wear underneath according to the weather, eg a short sleeve bodysuit, long sleeve bodysuit with no legs or a full length Bonds coverall.

I do have the heavyweight bags and even though I am in Melbourne I hardly used them with DS because our house is quite warm and he was a "hot" sleeper. We haven't done a Melbourne winter with DD yet but even so I am not sure I will use them with her either.

And yes, they are safe. There is no risk of bub pulling the covers over their head. DD does this with blankets all the time and so she now has the sleeping bag for her naps too.