Birth to age 5 is a critical time of learning and growth. Your child’s brain is born ready to learn with 100 billion neurons, and by age 5, her brain is 90% of its adult size! Lots of learning is packed into the first 5 years. You are your child’s first and most important teacher. Children learn best through everyday moments spent with you. Young children learn by using all of their senses, so everyday activities (that might seem boring to adults) are not only stimulating, they’re wonderful opportunities to learn.