When babies are born, they are slightly underdeveloped. The first few months of life is considered a "fourth trimester." The longest pregnancy ever recorded was a whopping 12.5 months! The baby born wasn't a small giant, but just 6 pounds, 15 ounces. In Japan, it's common to see an unsupervised six year old taking the subway to run errands or get somewhere. A woman named Anna Jarvis started the campaign to make Mother's Day an official holiday in 1905. President Wilson made it one in 1914. Babies can smell what you smell while in the womb, but won't be able to taste salt until around 4 months old. An Indian woman named Omkari Panwar became the world's oldest mother when she gave birth at age 72.