Has anyone else read the Miriam Stoppard piece in the Mirror today about child development? It was meant to reassure but I am ended up feeling worried about my one-year-old. There's a month by month chart and by 12 months a baby is meant to shake head for no, stack bricks and play clapping games. My baby understands no I'm sure (lip sticks out, cries) but she doesn't shake her head. She doesn't stack bricks up and though she clapped really early, she doesn't really play pat-a-cake. She sat at the right time and says daddy (although only mama when crying) and also didn't crawl properly until just before 11 months. Should I be worried?