Why not plan the vacation without the young one... you have the boat - and can do it as you desire... the vacation - you personally will miss out for the both of you - as you will always worry about baby... Personally (and my opinion)... you have the means at home to get the young one accustomed to... the vacation should be about the both of you as it is not the little one will remember anything to begin with...
Live a bit and makes you two grow together instead of worrying about how to make all three at such a stage work?
Most if not all marinas...have free loaner programs for flotation devices... you go in - give your name - etc... everyone walks away with a flotation device....
Especially useful for those that have younger than expected guests.. its CG initiative - free - no dues to be paid...(done it myself - it works)..
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Sailingdog Telstar 28
New England
You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.