Some hearing milestones your child should reach in the first year of life: 1  Most newborn infants startle or jump to sudden loud noises. 2  By 3 months, a baby usually recognizes a parent's voice. 3  By 6 months, a baby can usually turn his or her eyes or head toward a sound.
(December 2008). Direct digital control (DDC) is the automated control of a condition or process by a digital device (computer). DDC is considered by many to be a more modern, granular and responsive update to older HVAC control systems based upon PLC technologies.
DDt is a Pesticide and/or a wrestling move. The chemical name is Dichloro-Diphenyl-Trichloroethane. DDT is a chemical that helped stop malaria by killing the mosquitoes. i â¦ t was largely used during the second world war in order to kill insects.DT was first used in the second half of World War 2 to kill insects that spread diseases like malaria and typhus. After the war it was â¦ sold and used as a pesticide in homes and in agriculture.