Ancient megalodon sharks may have been at least 2 metres long at birth – and they might have grown so large by eating unhatched eggs in the uterus
Source:
https://www.newscientist.com/article/2264340-megalodon-sharks-grew-2-metres-long-in-the-uterus-by-eating-eggs/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home