Happiness awaits! A happy day favorite. these heathered grey baby pants do a fine job of keeping the fussies and baby blues at bay. Cute. cozy. casual and comfortable. our baby lounge pants feature a stretchy adjustable elastic waistband and soft cotton drawstring printed with a sweet and simple reminder to 'Be Happy.' Use the happy baby sweatpants as baby sleep pants. baby pajama pants. baby loungewear bottoms or baby jogger pants for matching with t-shirts. long sleeve sweatshirts and more.