So many ways to keep baby happy.

• Position: WHAT'S NEW? Holiday Gift Guide - Toys for infants

When it comes to keeping infants happy, one of the tricks is getting the right toy at the right time. The Lamaze Infant Development System from Learning Curve, RC2 Brands, Oak Brook, Ill., dedicated to encouraging creative and imaginative play, is helping to make these decisions easier by categorizing its toys by stages in color-coded boxes.

Stage One is for discovering the world, with toys that gently stimulate the senses with engaging patterns, contrasting primary colors, and pleasing sounds. These are in green boxes. The Grip & Grab Rattle is easy for babies to grasp onto for shaking and watching the balls fall through the clear corners of the pyramid-shaped toy. It also features teething nubs to soothe baby's gums.

The Tug and Play Knot Block features a series of cords knotted inside a clear cube, the ends of which have shapes that jingle, clink, and squeak. It has rings and teethers with various textures and the grabbing, tugging, and pulling builds coordination and strength.

Stage Two is for exploring and experimenting. These toys have simple and engaging activities such as peek-a-boo and interactive music and are...