Popsugar Family Little Kids Developmental Milestones by Age Track Your Child's Progress With These Developmental Milestones by Age March 9, 2018 by Katy Fabrie View On One Page Photo 2 of 10 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 2 4 Months Important milestones: Smiles spontaneously Responds to affection Can reach for a toy with one hand Can follow moving things with their eyes Holds up head unsupported Starts babbling Mimics some movements and facial expressions Related: 12 Gifts Newborns Will Love (Even If They Have No Idea What a Gift Is) Previous Next Start Slideshow Little KidsBabiesParentingEducation