Under the Highway Traffic Act, children must use a forward-facing child car seat when they weigh between 9 kg and 18 kg (20 to 40 lb.) You need to use a forward-facing child car seat until your child weighs at least 18 kilograms (40 lb.). This is a minimum requirement.
only one sperm can enter an egg (first come first serve) only one egg can be fertilized at a time Answer Actually 2 or more can but the baby won't make it to birth. My daughter died at 16 weeks. I had the baby tested and she had been fertilized by 2 sperms. I agree with this answer.
Fertilization occurs when one sperm penetrates the egg, combining their genetic material. The sperm and egg, each contain 23 chromosomes holding all of the information that determines your child's sex and contributes to the child's genetic make up, including physical appearance, intelligence, and personality.