Meiosis is indeed the process by which sex cells (sperm and egg cells) are formed. Meiosis involves two divisions, resulting in four daughter cells, each with half the number of chromosomes as the parent cell. This is crucial for maintaining the diploid number of chromosomes when fertilization occurs.
In humans, the diploid number of chromosomes is typically 46 (23 pairs). During meiosis, the chromosome number is halved, resulting in sex cells (gametes) with 23 chromosomes each.
So, both sperm cells and egg cells have 23 chromosomes before they come together during fertilization. When a sperm cell (with 23 chromosomes) fertilizes an egg cell (with 23 chromosomes), the resulting zygote has the full diploid number of 46 chromosomes, which is the typical number for a human cell. This zygote then begins to develop into a new individual, which eventually becomes a fetus and is born as a cub (if you meant "child" or "baby" instead of "cub").