They are all so stinking cute! I love new ducklings. I have 3 welshies that I hatched last spring (all drakes) and their bills looked like # 1 & 2. #3 could go either way. Seems light enough to be a girl but that large patch of dark towards the face could mean a drake. You're so lucky to have at least 1 girl in the mix! I was hoping for a girl...my guys are pretty cool though

I attached a pic of one of my guys the day they hatched. Not the best pic of his bill bc of the glare, but you can see how he had that pink in the center. None of mine had a solid black bill like your #5. I wish they were all that easy to sex!!