LO has the 0+ Mam dummies, as did my DD at his age. But i moved her up to the bigger ones because i swear they used to say 4months+ on them. Now they say 6? Iv given Zach a bigger one today because he keeps spitting his others out, and not latching on to them properly. He seems fine with the bigger ones but im a bit worried there too big for him and he will choke? Any other mam users? & when did you move them up a size?