A parent asks the nurse why their newborn has a congenital deformity. Which is the best response by the nurse to explain the cause related to fetal development?

"Deformities are usually caused by events happening during labor and delivery, not during pregnancy."

"Genetics is the only reason babies are born with deformities, so environmental factors are not involved."

"Most major organ development occurs early in pregnancy, between weeks 3 and 8, so exposure to harmful substances during that time may have caused the deformity."

"Deformities occur because organs develop throughout the entire pregnancy, so problems can happen anytime."