Baby Building Blocks, Stacking and Nesting Toys Babies love exploring objects. Soft baby building blocks are great for introducing babies to building blocks. Some of the blocks, like the Haba Soft Blocks, Discovery Cubes and Knock-Knock Building Blocks by IQ Baby has a lot of features for babies to explore and serves multiple purposes:

Visual stimulation for newborns,

Tactile stimulation with the different textures,

Teaching object permanence and much more.

At first babies will hold the blocks, exploring them with their mouths and if mommy stacked some blocks baby will definitely knock them over. Between eight to twelve months babies start banging blocks together and on surfaces - loving the new game and the noise they can make. A new developmental milestone is reached once the baby can let go of the blocks and this will be the time when you should encourage your baby to start stacking blocks himself.
Stacking and Nesting toys like the Rainbow Cups by Tolo and Grimm's Nesting Bowls are excellent for stacking games, nesting games, hide-the-toy under the cup games and first memory games(under which cup is the toy). These games introduce babies to important concepts like object permanence (the toy still exists even if you can't see it), early math (bigger/smaller) and also develops hand-eye coordination