I Thought All Baby Toys Were Essentially the Same . . . Until I Found This

In order to subscribe, parents sign up and receive a box every other month that focuses on age-appropriate development. Each kit comes with a guide and a smattering of toys and gizmos that are compatible with your child's age (and it's all backed by research).

My daughter was 5 months at the time we got our Play Kit, so we received The Sensor.