As a nursery nurse please may I suggest you use the next 9 days to prepare your children in going back.
If you're rocking them to sleep, please try to encourage them to self soothe another way.
If you're feeding them encourage them to try and feed themselves.
If you've let bad habits slip by in the past weeks prepare them for routine.
It is going to be a hard adjustment being away from you and being back in a new environment even if theyve been used to nursery beforehand. Support them by giving them tools to thrive. As much as I would love to cuddle babies to sleep I have at least 11 so it's not feasible the same with feeding a 2 year old isnt easy when 16 of them are asking to be fed. Encourage your baby to try and feed themselves a bottle, they will be supported but if I have a 5 month old needing a bottle at the same time as a 13 month i need to help the baby and sit alone aside the older one.
It will be hard for them to adjust so please support them in this transition