Very pretty baby!
Lots of bananas look pastel with the faded heads and some blushing. It's the most common gene I see people 'guess' is in their bananas/cgs.
Until/unless you can get more info on the parentage, I'd just go with banana. If you do end up breeding down the line, should be pretty easy to tell if pastel is in the mix based on the resulting offspring.
Congrats on your new little one!