Was heißt »Geschwisterchen« auf Englisch?

Das Substantiv Geschwisterchen lässt sich wie folgt von Deutsch auf Englisch übersetzen:

Deutsch/Englische Beispielübersetzungen

Als er erfuhr, dass er bald ein neues Geschwisterchen bekäme, war Oliver überglücklich.: When he learned that he would have a new brother or sister, Oliver was overjoyed.
Vladimir möchte ein Geschwisterchen.: Vladimir wants a sibling.

She was like a little sister to me.
Your little sister looks up to you, Tom.
I walk my little sister to school every morning.
This is my little sister, Mary.
This is the first time I've heard my little brother call me "big sister."
Three decades on, the former East Germany is catching up economically with its Western sibling.
Tom has a little brother.
I have a little brother and a big sister.
"So, what did you get for Christmas?" "I got a computer game from my father, a couple of jumpers from my mother, some wooden toys from my grandparents, and from my little sister a picture she painted for me."
My little brother is at primary school.
My little brother goes to primary school.
My little brother attends primary school.
I have to take care of my little brother until my parents get home.
His little brother is a famous footballer.
He's my youngest sibling.
Her little brother is a famous soccer player.
Lobbying is the little brother of corruption.
Mary is like a little sister to me.
I'm no good at sport myself, but my little sister's among the best tennis players in the school.
I want to buy a shirt for my little sister.