As I mentioned in another earlier posting, I found a PFD that fits
comfortably (and correctly) on my little one. The brand name is "sea
fit" purchased from west marine and was sized for infants less than 30
pounds. I mentioned I had purchased others as well but when she was a
week old this one fit the best. -We had water tested them as well.-

Most of the smaller ones you see do start at 30 pounds but if you look
you will find the smaller types. For the smallest of babies, look for
the type that has the closed back (with no flotation along the back) so
that is has a wider range of adjustment. I chose to stay away from the
types that only had the starps across the back. The one I use has
thinner flotation in the headrest, making it more comfortable, while
still doing it's job.