Jak,
The main thing is to take her sailing on a short trip and see how she reacts to being on the boat. If she is nausiated and throwing up she will dehydrate rapidly.
I think if you pick a day to break the ice and see how she takes to it the life jacket could be handy but not on.
I don't have children of my own but deal with this on a daily baisis. It is a tuff call.
My advice would be to go for a afternoon sail for a couple hours and build from there.
In my expierience kids are usually tougher( and less concerned) than adults. So the most important thing is that You and Mom get comfortable with having the baby onboard. I guarantee you are more anxiouse than she is.
Faster Great Post
