Looking for ways to keep little hands busy & mind engaged? Here are the best development activities for toddlers 12 months old. 59 fun toddler activities for 1 year olds that will help develop language, social, speech, cognitive & social-emotional skills. Plus simple gross & fine motor activities for toddlers to promote physical development in your 12 month old. Easy sensory activities toddlers will enjoy. Keep your 1 year olds entertained with these development activities for toddlers