Are guppies born male or female

https://www.youtube.com/watch?v=xG886Cp9KCs
To dispel misinformation and myths once and for all, guppies cannot change sex and are not hermaphrodites. Females need males to fertilize their eggs and produce offspring, but they will also store the males’ sperm several months for when males are not available. Jan 20, 2022 (source)
A unique feature among female guppies is their remarkable ability to give birth to several broods consecutively without male insemination occurring each time. This is possible because of special folds in the female’s genital area that store sperm until it is later needed for fertilization. (source)
21–30 days Guppy. Guppies are highly prolific livebearers giving birth to between five and 30 fry, though under extreme circumstances, she may give birth to only one or two or over 100. The gestation period of a guppy is typically 21–30 days, but can vary considerably. (source)
Gasparini had found that an interaction between ovarian fluid and sperm resulted in sperm from a sibling travelling at a slower pace than from an unrelated male, reducing the success of that sibling’s sperm. May 7, 2014 (source)
Typically, the fry are delivered one at a time, although they may appear in quick succession with pauses between groups of babies. The baby guppies are usually born curled into small balls, just as they matured in the female’s womb in this compact shape. (source)
When they’re born, all guppy fry look the same regardless of gender. There’s simply no way of telling which is male and which is female. As they continue to grow, differences start to appear. These differences are subtle in the beginning, but as growth rate accelerates, they become more and more noticeable. May 23, 2019 (source)
A female guppy can have 50-60 young at one time. When Mother Nature sees such a large family, she knows that the fish tank is overcrowded. The female guppy gets the word and produces only two dozen or so of babies. May 29, 2022 (source)
https://www.youtube.com/watch?v=YTWYuKb4Pxw
Guppy mating takes less than a second, and it looks just like he is stinging her at her vent where her gravid spot is located. This is the dark spot just behind the female’s abdomen. Although the breeding is extremely quick, numerous breedings will take place to ensure the female has been fertilized. (source)
Guppy pregnancy lasts for roughly a month from conception. First-time mamas deliver about 12 to 30 babies over a period of several hours. Veterans may gift you with 50 to 80 or more fry in a few hours. (source)