To expand further on my colleague's point above, any children born to you abroad before the date of your naturalisation certificate will have the same UK Immigration status as that of the less-privileged parent (in this case, their mother) and will need to move to the UK on the same visa as their other parent for at least five years before they can apply for ILR.
Your British citizenship acquired after their birth will not assist or benefit them in any way to acquire British citizenship automatically.
Depending on their age when they get ILR, they can then either be registered as British citizens (before their 18th birthday) or naturalise in their own right , meeting all the requirements (after their 18th birthday).
I am not a lawyer or immigration advisor. My statements/comments do not constitute legal advice. E&OE. Please do not PM me for advice.