Wouldn’t it be more of a survival advantage to give birth at any time of year instead of just a highly competitive window of time?
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It’s more advantageous to give birth when you’ll be able to more easily provide for your young, so you want to time it for spring or so, not the dead of winter depending on biome and food source, not claiming this is universal. It is also only one factor.
Humans don’t have to worry about that anymore, but even many primates don’t have seasons. Social groups, clines that don’t have harsh winters, and other aspects may lessen the need for a season.
Another aspect of the whole idea of mate selection. A single male can impregnate many females. If all the females are ready to breed at the same time, it limits a single male’s ability to dominate the genre pool and forces him to be more invested in the offspring of a single female. It’s better for the gene pool and the offspring.
Nothing is absolute of course. Different species have different strategies, so don’t try to apply anything too broadly.
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