Do you definitely want to go abroad?
We've got a baby under one and we are having a UK holiday this year because, thinking about it, I decided it would be a much more relaxed time if we could just load up the car with all the stuff we need and drive somewhere with a sandy beach on the doorstep. You don't need a lot with a baby in terms of things to see and do.
We've got a lovely modern self catering house with a big garden and hot tub for me and DH. We can take all the stuff we need and just relax. No worries about travel cots and high chairs and sterilisers and what brand of nappies we'll be able to get once we're there. We've got it all.
We do like going abroad and will in future, but the first holiday for us was more about having time as a family, and making that as easy as possible - it didn't matter so much about flying to another country.
It all seemed much less faff and stress to stay in the UK, and these days you're pretty much as likely to get nice weather as going abroad. The climate here has changed and it's much more guaranteed good weather in June/July.
Having said all that, if you do go abroad, I would highly recommend a villa in Skala, Kefalonia!