Since Avery has turned 7 months for some reason I really feel like she needs to learn to sit as soon as possible. So we work on it every day! Today she sat for 3 seconds before falling and I caught it on video...lol, does that count? I guess we will keep practicing. I wonder what age is the average age. I'm sure she's not behind yet if I count her as being her adjusted age of 5 months. When did your baby sit?