I use those nipples to and my girls are fine with it however, when they are in the brooder I train them using a small gerbil waterer when they are 2to3 weeks old then switch to a bigger gerbil waterer for the last 3weeks before putting outside. I have done several this way with no issues.their beaks at that old might not be able to trigger it. You could try tapping it real fast so it makes the ticking noise then put there beaks up to it so they get water on them. But really, they might be to young to trigger them. The nipples themselves are great, my 5gallon bucket has a lid on it so no flies,poo or dust just good clean water for them. You also don't have to worry about it tipping over and spilling. Good luck