New-parent mistake No. 9: Fighting too much (or too little) in front of your baby

Even a 3-month old will pick up vibes," Friel says. In terms of fighting, he suggests you ask yourself “Is it scary?” or “Is it frequent?” "Look at the intensity and frequency of your fights," he says. "Snapping every now and then is a normal part of living with another person. And when people start to suppress too much, it's just as bad as going to the other extreme."