The right hemisphere is dominant during the brain growth spurt from the last trimester of pregnancy through the third year of life, with evidence suggesting right lateralization even in utero.

“all of that time is a period of right hemisphere dominance and actually there have been six major studies in Neuroscience Laboratories around the world that have shown that the right hemisphere is dominant during that period of time in fact there recent study in Mexico where they looked at 2 to 3 months 6 to 8 months 9 to 12 months at each point in time they noticed that the right hemisphere was accelerating its growth the left was not so the right is dominant very early in fact there's evidence to to show that even in utero there is a right lateralization”