This is Level 4 of The Monti Kids® Program, a three-year curriculum designed by Montessori educators. When you subscribe, you'll receive support for your baby's learning with a delivery of authentic Montessori toys and developmental activities every three months, plus expert support for you.Once your baby is crawling, they will crave constant movement. The activities in this Level will encourage your little one to find purpose for their new-found mobility and to refine their hand movements.