A “frog” leg position is when a baby’s hips are flexed and open out to the side so that their inner leg is resting on the floor. Often this is the result of tightness due to growing in a curled up position while in the womb. As babies are exposed to more space, more positions, and start to explore movement of their limbs, you this decrease.
If this position remains the preference, you may see a limit to progression with tummy time, difficulty with rolling, and decreased opportunity for strengthening/stretching the hips to counteract positioning from time in the womb.
To help your child achieve a more neutral leg position, gently straighten out the hips so his or her legs are pointing straight behind them and knees are face down to the ground. Providing your baby opportunities to practice tummy time with this leg position will support them building the hip strength needed to progress with their locomotion skills.