Initially, the amount of crying between male and female babies is similar, but this changes as hormone levels develop.
Based on the information provided:
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Early Infancy: There isn't a significant difference in crying between male and female babies at first.
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Hormonal Influence: As boys' testosterone levels increase, their crying tends to decrease. Conversely, as girls' estrogen levels increase, their crying tends to increase. "As testosterone levels ramp up in boys, their amount of crying plummets. As estrogen levels rise in girls, however, their crying increases".
Therefore, while male and female babies might cry a similar amount initially, female babies tend to cry more as they get older due to the influence of rising estrogen levels. The link between prolactin (associated with breast milk production, which occurs in women) and crying is also interesting to note.
