Why most mammals cannot become pregnant whilst already nursing a baby.
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Hormones – while the baby is present it stimulates the production of hormones that block ovulation, because it’s reproductively advantageous for a mother to raise the young she already birthed, to an independent age, before she becomes pregnant again as resource scarcity makes it too taxing. For creatures for whom food is abundant, the cool down period between possible pregnancies is much shorter – e.g. humans, rodents, lions etc.
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