A baby falling flat on its face after rolling around in a walker demonstrates why you should never leave your baby alone. CCTV footage from Ho Chi Minh City, Vietnam, shows a baby rolling around in a red walker on the pavement outside a shop. The baby's mother sees that it is walking towards the kerb and intervenes to turn it away from the danger. But as soon as its mother is gone, the baby turns around an ploughs straight into the kerb, falling flat on its face. The mother then rushes to pick up her seemingly unfazed child. The video was captured on April 5 last year.