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DNA is the building blocks of the human and every other living organism.  Each organism from a leaf to a human has a definitive number of chromosomes which make up the DNA.   The DNA is found as two stands coiled around an imaginary center.

Every normal human has 46 pairs of chromosomes - 23 sets.  Each set has two chromosomes.  Each parent contributes 23 of these or one half of the pairs.  44 determine things such as hair color, height, etc.  Two (one set) determine the sex of the baby.  There are two sex chromosomes - an X and a Y.  The Y chromosome is shorter than the X.       The sex of your baby is established at the moment of Conception.  Dad's sperm chromosome compliment determines sex of baby.   It is dependant on whether a "Y" chromosome containing sperm fertilizes the egg or an "X" chromosome containing sperm fertilizes the egg.  Mom only has one type of egg - one with an "X" chromosome.  If a baby has 2 "X" chromosomes, it's a girl.  An XY chromosome pair is a boy.

ADDITIONAL RESOURCES THAT MAY HELP: Swarthmore College Explains it. Determination of Sex Fun with Finding the Sex of Your Baby

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