good luck with that one!!
Get the Esprit brochure for ideas and costs (it will be eye watering btw!)
problem is that a lot of the companies are geared around you skiing and your kids being in childcare without you. Not my idea of a family holiday, but difficult to ski with a 6 month old strapped to your back I guess!
Problems you might find (with esprit anyway) is the ski classes for the 3 yr old are in the afternoon and the 6 year are in the morning. If you want 3 year old to ski you will need to pay for morning non ski childcare too.
Think about the transfers. They can take ages esp if you go to the French resorts -3 hours on a coach with a baby on your knee and a moaning 3 year old! Go for a resort with as short a transfer time as possible. Price up a private transfer.
Think about other facilities - pools etc you won't be skiing all the time with young children. 6 year old will only be in lessons half day anyway.
I would avoid self catering in an apartment - they tend to be very cramped and basic. I would only consider a chalet. Catered is good - you get cake every afternoon and you will get a proper break. You will have enough to do dealing with the kids without having to cook for everyone or drag tired children out to eat every night.
Your DH will have to have realistic expectations - it cannot, and will not be like it was pre kids. He will have to prepare to be frustrated..
Friends have have done the following:
rented a small chalet and taken Gran to look after kids
gone as a larger group with other families. Split up childcare duties amongst the familes (prob won't work with such a small baby though)
Mine are 3 & 5 and I'm not considering it yet. I fear they would go on first day, find it cold and hard work and not want to go back again. Holiday would be ruined.
Sorry I realise that this all sounds a bit negative - I just want you to really think about the practicalities. I find skiing holidays exhausting before even adding kids into the equation!! Have you checked out how much Barbados is
!!!