WHITE PLAINS, N.Y. (PIX11) --- A New York nanny is headed to prison for shaking a 3-month-old baby so hard he turned blue and had seizures, authorities said Tuesday. Nija Woodbury, 23, was sentenced to six months behind bars and five years probation after pleading guilty to felony reckless assault of a child last year, prosecutors said. Woodbury was working for a family in Mount Pleasant when she shook and bounced the infant when he wouldn't st…