Put baby in a laundry basket with toys (tons of sunscreen and adult supervision please) and place in the shallow waves on the beach. Last beach trip, she ate all the sand, this time she can only dip her toys in the water and stay cool in the gentle waves.
This beach wave tutorial leaves perfectly undone summer waves with just enough volume. This technique also creates volume in limp, straight hair. You can also use this method to smooth unruly natural waves. I tried this and it works great!