Gibbs Developmental Timeline By emmalanikea Jan 9, 2001 4 months Infants turn from stomach to side Feb 9, 2001 5 months Infants turn from stomach to back Mar 9, 2001 6 months Infants turn from back to stomach May 9, 2001 8 months Infants sit Jun 9, 2001 9 months Infant crawls Aug 9, 2001 11 months Infant kneels Oct 9, 2001 13 months Infant stands Dec 9, 2001 15 months Infant walks