Firstly, bear it in mind that Marijuana is illegal. On effect on the baby, Marijuana exposure in the womb has both short- and long-term effects on the baby.
Short-term effects may include low response to light stimuli, tremors and more high-pitched cries.

Research shows that Long-term effects include both physical and developmental problems. Physically, children will have smaller head circumferences, which often do not correct as they grow, so they will look physically look different from their peers. Developmentally, children will have higher rates of increased hyperactivity, impulsivity, and delinquency. Children who had marijuana exposure in the first and second trimesters have been found to possess lower IQ scores than children of the same age who were not exposed.