Thirdborn

Mary, the thirdborn Bennett child in the novel Pride and Prejudice, receives the least attention.

Prince Arthur was Queen Victoria's thirdborn son and her seventh child overall.

After correcting for factors that may affect scores, including parents’ education level, maternal age at birth and family size, the researchers found that eldest children scored an average of 103.2, about 3 percent higher than second children (100.3) and 4 percent higher than thirdborns (99.0).