Got 4 new baby chicks yesterday (all female) I was holding each one today and noticed my 2 brown ones had a stinky smell, almost like dirty barn smell but my 2 black ones had no smell at all. Why is that? This is my first flock. We’re keeping them inside since they are only a few days old, their poops are all healthy, and I make sure to keep them at 96 degrees. 4in of shredded newspaper, I check every 2 hours to see if they’ve spilled any water so they never have any wet bedding and they have a constant supply of food. Is it just the type of hen or is it something I should be worried about? Because I keep all 4 together but only 2/4 smell and they happen to be the brown ones whereas my black ones don’t smell at all.