I think both of your peacicks are girls.
here is a photo I took last year... might help you see the difference.
These chicks are probably a month older than yours..... girl on top, boy below.
They are IB's the photo was taken in October last year. My best guess is they are around 3 months old... possibly 4 at the very oldest.
Peachicks start out with some barring but the hens lose theirs, and the boys get more.
Yes, the splash baby is a blue splash maran... from my own line