Center parcs may or June?

[Missushb]

Planning to book center parcs whinfell for a week in may or June, im dithering because we will have a 5 year old and a baby, so baby will either be 16 weeks if we go may or 19 weeks if we opt for June. Is there much difference and would it be daft to wait until 3 weeks later?! Just thought it would better going when baby is a bit older but suppose 3 weeks doesn't make huge difference? Also thinking about going for 7 days anyone went for that length of time? Been for weekends and 4 night before.

Really don't think it will make much difference though weather has a better chance of being nicer in June obviously- that would be main factor for me.
Bear in mind that 7 nights is a LOT more expensive than 4.
Have a lovely time, we went last year

I think 7 days is too long.
I'd go in June when the weather is better and there's no school holidays. I don't think your babies age will matter for the sake of 3 weeks though.