Jenna and Jillian Thistlethwaite are special. Not because they’re twins and not because they’re babies – though definitely those, too! – but because their birth was one in 10,000. How so? The twins were mono-mono: monozygotic (identical) and monoamniotic (they shared the same sack and placenta). So it’s no surprise that they bonded – to the point of being born holding . Now that’s awesome.