2 bed bugs

I have 2 under 2 - toddler is 23 months and baby is 4 months. I have co-slept/bed-shared with toddler since he was like 4 days old. Started co-sleeping/bed-sharing with baby immediately. Toddler is behind me, in the middle of the bed, between my husband and me. Baby is on my side. I have a sidecar bassinet on my side just in case she were to roll.

This arrangement works great and we’re all sleeping well. My question is, for those of you who bed-share with two kids - how old does your youngest have to be for you to let the kids sleep next to each other? Basically, when can I roll over with baby and have baby and toddler in the middle of the bed? When could I leave both kids in bed (with a monitor) to have some me time in between their bed time and mine? I initially thought 6 months but now I think that’s too soon. Interested to hear what others have done.

I mostly worry about them bumping heads. My toddler is your typical toddler sleeper - lots of crazy positions and moving around. He’ll sometimes sit up and then just throw his upper body down in bed 😅 sometimes on the pillow and sometimes the other direction.