A mama aphid can produce a lot of babies in a short amount of time due to their reproductive strategy of parthenogenesis, meaning they can reproduce asexually. In the spring and summer months, this can result in up to a dozen live young being born each day. In some species, these daughter nymphs are already carrying more daughter embryos, meaning they are born pregnant. Although these nymphs still need to mature to the adult stage before they can give birth, development can take as little as a week in good conditions, so tens of generations of aphids can spawn in just a couple of months.