[BigLew]

My guess, and it is that, would be the third one. The reasons are that:
1. It looks like it may be most comfortable. Comfort is not so much the point. What is the point is because you don't want mom or dad or anyone else loosening, adjusting straps or adjusting it in anyway that could result in your papoose slipping out of it at the wrong time.

2. It will float her face up with head support; an absolute must. The crotch strap is seriously important. Anyone in a vest who goes in the water and holds their arms up to wave for help, reach for mommy or anything else will slip out the bottom if it not proper adjusted in general and has a worthwhile crotch strap.

3. The second appears that the arm and head openings (important) are a little bigger than they might be, other than that # 2 would be my first choice because of the head floatation.

4. The first one just doesn't look at all comfortable. We sold them at WM and the floatation blocks were so thick the the babies couldn't hold anything in two hands because they couldn't get their arms around the floatation.

If I may make a suggestion or two, Make sure you try it on before you buy it or be sure you can return for what ever reason, if you don't like the fit. The other thing is acclimate the angle to the vest at the pool both in terms of being in the water with it on and wearing for an extended period of time. Also, buy a lighter color because the dark color absorbs a lot of heat and added to 5/8's to 3/4 inch of insulation, she's going to need all the cooling she can get!

Good luck to Mom, Dad and your gift from God!