3 out of my 5 white leghorns have large red comb, one of the other 2 is reddening and growing her comb while the other one is still mild pink. They are around 18 weeks old. There have been decoy eggs in the boxes for a couple weeks now. The oldest pullet has started squatting, the younger 2 squat sometimes too. Should I keep them in the coop for a bit longer than usual so they investigate the boxes?