At one month a baby usually resorts to lying in positions that they are comfortable and used to inside your womb. While in the womb your baby had his legs curled up to his chest. Some tips to keep his legs straight involve: - Some gentle movement of the legs daily to straighten and strengthen his muscles. - Try swaddling your baby in cloths while leaving enough room for his knees and hips to bend. Remember, that this is normal and with time he will automatically adjust to what is considered normal. ​