I will depend on if you are currently jointly assessed and all the credits etc. are split down the middle.
If so, he will have additional income of €1,630 (your personal credit)
Also an additional €9,000 of cut-off point can be transferred to him so he will have an extra €9,000 @22% = €1,980.
That's an additional €3,610 net salary he will get per annum.
Say your net annual salary is currently 20K and your childcare bill is 10K.
In summary you are down 20K, save 10K in childcare and husband net salary up 3,610. So overall you are down €6,390.
You can transfer credits mid year. Call PAYE helpline on 1890333425 (if in Dublin)