Noticing your baby's signal is one of the toughest parts of doing EC. Your baby may signal strongly as a newborn and then stop signaling at 4-5 months of age, and may not pick up again for many months thereafter. If your baby continues to signal during this period, great! It just might look different than it did when baby was born, so you can adapt to what you see and hear.
If you want a good example of a baby's pee signal when doing elimination communication, watch my video, below, which features my first son at 5 months old asking for the potty during playtime, and being pottied on a mini potty.