Looks to me it's a painted water turtle lol.. but yeah the diet you said( aSnakeLovinBabe) was right on the money lol I have a baby red ear that size i hatched.. And UVB is a VERY important part of it growing.. Sweet little baby you got there any names? Heres my female adult red ear to give you a guesstimate of how big they get and she still growing too.. I named her big momma.. well for obvious reasons lol

Big Momma And my hand.. (Size comparasion)


Big momma next to Flow Map turtle (AKA Yellow belly slider. Yellow cooter and so on) lol