I hadn't wanted to use a pacifier but since Emerson hates her carseat so much I decided to give it a try since she is 5 weeks old. Apparently she didn't think it was a good idea. It turned her pitiful crying to bloody murder screaming. So I guess we'll have to cope a little longer until she can gain some body control and suck her thumb. She gets so tense she can't reach her hands up to her mouth when she is crying. Maybe one day she will think the carseat is not a torture device.