Swimsuit debate

Ok I need to know everyone's opinions on something. Do you think bikinis are appropriate for little girls? Like babies and little girls Hailey's age or a little older? I'm a really modest person, I don't even like wearing tank tops or shorts because I feel like I'm showing too much skin. I've gotten over this some and I'll now wear a lower cut shirt with a tank underneath or shorts if it's really really hot in the summer. So I'm not sure if it's my modesty or what, but I can't help but feel like bikinis are completely inappropriate for little girls. Esp. the little triangle top ones. But I know a lot of people, including my mother, mother in law and husband, feel like when they're as young as Hailey that's the only time a bikini IS appropriate, because they're so young and innocent...and when they get to be like school aged, that's when they become inappropriate. Last year I bought Hailey a one piece to keep at the sitter's, her cute little dark blue polka dotted one piece for home and then my mother in law got her a bikini for her birthday...it was a triangle top and boy shorts. She wore it once...MAYBE twice...at home in our front yard (now with the child molesting Mexicans living a few doors down no WAY would I let her wear a bikini at home--but we're moving this summer, so that won't be a problem). So I'm debating on whether or not to get her one this year. I've found 2 swimsuits at Old Navy that I LOVE and one is a bikini, ruffles all around the bikini bottoms, totally girly. The other is a one piece with a cut out back that I think is almost equally adorable. I'm for sure getting her the one piece if they have it in the store tonight when I go. What I'm trying to decide on though, is whether or not to get her the completely adorable bikini too or try to find another one piece I like. And yes she needs two swimsuits. Sometimes one might not get washed right away and she'll need a clean suit (like if we go to the Lake for a weekend--the cabin doesn't have a washer and dryer). It's not good for little girls to wear dirty suits or sit in a wet suit for long periods of time (or any female for that matter, not just little girls) as it can cause yeast infections or other irritations. Some women/girls have NO problems w/ this whatsoever. But we were, unfortunately, blessed with sensitive hoohas that get irritated really easily. :)

Here are the suits...