how do you create a red head child? do they need both genes from mother and father to create the red head baby?

You need genes from both parents. red hair is recessive

A  reaction  in which  energy  is  released  to the surroundings is called an exothermic  reaction. in this type of  reaction  the enthalpy, or stored  chemical energy, is lower for the products than the reactants. when ammonium nitrate is dissolved in water,  energyis  absorbed  and the water cools.