Screaming 4m old. Infacol, gripe water, feeding, calpol, nothing worked. Put on white noise on youtube. 0.3 seconds later, screaming stopped and baby asleep.
I've heard plenty of people mention it in passing but never knew it would be so eerily immediate and effective. Never used it with previous DD but occasionally put on the hairdryer for about 1/100th the same effect.
Why does it work? It sounds like a swarm of bees to me. What's the science?