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.
Best Answer: A female egg has 23 chromosomes. A male sperm has 23 chromosomes. Thus, when a sperm fertilizes an egg, the embryo has 46 chromosomes. Women have two x chromosomes, whereas males have an x and a y. Each contribute one. The woman will always contribute an x. If the man contributes an x, the child will be female. If he contributes a y, the child will be male.