Explanation:
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if every adult couple (2 people, 1 man, 1 woman) has 3 or more children, then there are automatically more children than adults.
it is absolutely possible that there are more boys than girls, as it is also possible that there are more girls than boys.
after all, this is a 50% chance, and it is very unlikely that a 50% chance has a true 50/50 split in real events or experiments.
like when flipping a coin. heads and tails will almost never be mathematically precisely split. there will be more heads or more tails.
this might be due to imbalances in the flipping process or in the coin balance itself. or, if truly balanced, it will achieve the full 50/50 split after infinite attempts.