Hello I'm hoping someone can help me out. I have six 3 week old ducklings all are doing great except one. One of my buffs is much smaller than the rest, has a couple bald spots and this morning I found her on her back unable to get up. She's running around with the others now acting normal eating drinking. This is the first time I've had any issue with any of my ducks so I'm freaking out. Any ideas on what it could be? Thank you in advance for any input.