The term "illegitimate child" has increasingly become obsolete and stigmatizing, due to its negative connotations. There are many well-suited synonyms to replace this outdated term, such as "non-marital child," "extra-marital child," "unwed mother's child," "natural child," or simply "born out of wedlock." These synonyms are much more neutral and empathetic than the traditional phrase and reflect a more compassionate and understanding approach to families and children that may not fit into traditional, societal norms. It's important to use language that upholds the dignity and respect of all individuals, regardless of their circumstances or background.