When will they molt?

[threeducks]

OK.. so Im a newbie and have no idea what to expect ! My mallards are about 4 weeks old and I have noticed new tail feathers but Ive also noticed that they have become sparce, almost as if someone was pulling them out although I spend a LOT of time with them and it doesnt seem that anyone is getting picked on. Is this normal? How old are they when they have the first molt?

 

[xfilesnumber1fan]

I also have 4 week old mallards 6 of them..Mine look alittle like spots are missing its normal when the feathers are coming in and the fluff is leaving they can look alittle funny...LOL