Hi Jak,
my answer is - get yourself a similarly looking "traditional" PFD. Babies are OK to do whaever if their parents do it. My girl was REQUESTING to get into the PFD when she saw me putting mine on
).
On the other hand, although our girl (2.5 now) got on a boat at a very early age, she sailed only in the main cabin until she was over a year old.
You can get her a great baby hammock so that she is comfortable underway -
Hammocks - Hammock Heaven, check the Bambi
line. Attaches to cabin handrails in a second.
Regards,
Stan