I use a Thule Ride Along child seat. It works great from when my kid was 9 months to now which is 2.5 years old. The restraining belts made me feel at ease but now she's at the point where she likes to move around and dance in her seat. With that, the bike starts to feel top heavy. I don't trust her to sit on her own on a cargo seat. I went out and bought a Burley trailer and she's been loving it. More room and she can have her dinosaurs and snacks back there with her.