We've been EC'ing since my son was 7 weeks. In addition to making a "ssssss" sound when we think he has to go, I've been giving him the sign language toilet sign since about 3 months whenever he successfully pees in a potty. I've suspected that he was using the sign before now. but today he was really obvious about it a number of times and our misses went down a lot. Yay! My toddler didn't start signing (to nurse--we didn't EC with him) until 8 or 9 months, so for him to start at just under 5 months is so exciting!