Sensory Exposure, Babies need a lot of sensory exposure because they are multisensory learners according to Maria Montessori. Do not shy away from letting them crawl into the grass, go into the mud or sand or water. Of course we need to be wary of their mouthing habits but give a lot of natural exposure like grass, sea, air, mud, water, trees or anything! http://app.babychakra.com/article/1812