Sorry to answer a question with a question, but side effects of what exactly?
One can read the UN Convention on the Rights of the Child online on the official UN website. A dedicated agent will help you find and analyze the document.
un enfant
un enfant
a child
a child is "un enfant" or "une enfant" in French
Unless the child is technically a bastard, yes it is wrong. Even if the child is technically a bastard, it is immoral and un-Christian to apply the label. Understand that bastardy means that a child is born of an unwed mother. This used to connote a loss of legal rights to the child, but not to the mother. The object of the loss of these rights was to permanently punish the child for the mother's sin of fornication and for not being married on the day of the child's birth. It is immoral and un-Christian to blame a child for the sins of their parent.
The UN
Ko Un was born on January 8, 1933.
Pirom Un-Prasert was born in 1953.
Kim Un-Ju was born in 1989.
Jeon Myeong-un was born in 1884.
Yi Un was born on 1897-10-20.