Men born small for gestational age or with low birth weight
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The study found that whether the reduced reproductive rate among men born small for gestational age (SGA) or with low birth weight (LBW) is present after up to 44 years of follow-up.

All men born in Sweden between 1973 and 1993 (n = 1,045,167) were followed up to 2018.

- Men born SGA or with LBW have a lower chance of becoming fathers than men born with normal birth characteristics: hazard ratio 0.91 and 0.88, respectively.

- The reduction in reproductive rate is more evident after a longer follow-up time.

- Men born SGA were more likely to receive a diagnosis of infertility.

- Sperm donation and intracytoplasmic sperm injection were more often used in men born SGA, further strengthening the hypothesis of an association between birth characteristics and male infertility.

In conclusion, men born SGA or with LBW have a lower chance of becoming fathers, but the reduction in fertility is smaller for the younger cohort.

Fertility and Sterility
Source: https://doi.org/10.1016/j.fertnstert.2021.05.078
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