Hi.
Deneen has a great point.
However, it is also interesting to know that toy manufacturers consistently over-estimate the appropriate age measure from a *developmental* standpoint (usually by about 6 months) on purpose so that an infant (or child) can play with the thing right out of the box, and the parents think, "what a great toy."--but the kid gains no developmental challenge from playing with it.
So, if the point of picking a certain toy is to encourage developmentally appropriate learning, you want to choose a toy they have to *learn* how to play with, and monitor your baby when they are playing with the toy so they don't get hurt.
Also, toys that can be played with 10 different ways (like plain blocks) will give more use and benefit than a toy you can only play with 1 or 2 ways (like battery-operated toys).
t