<prompt> The following signs would warrant fuher evaluation of developmental status in a healthy 12 weeks old infant:Dose not vocalizeDose not babbleDose not raise head up to 90degDose not transfer a bright red ring from one hand to the other, even when the ring is directly placed in the hand of child  <response>: A baby with 12 weeks of age should vocalise. If not, baby should warrant further evaluation. Ref: Kligman, Behrman, Jenson, Stanton 2007, Pa II, Growth, Development and Behavior , In the book, Nelsons Textbook of Pediatrics, Volume 1, 18th Edition, New Delhi, Pages 43-47 