As a Pediatric Developmental Therapist who works with babies and toddlers, I don't believe in putting worksheets and flashcards in front of them as a way to foster learning.
Kids learn through play, period!
My worksheets are geared towards play, fun, and learning. For example, you can put colors, letters, numbers, and shapes in sensory bins or use them as big motor movements as your little one jumps from one color to another. Or, print off the black and white packet for babies to look at as they develop their visual senses.