aA Son A Son

Although it's not a noun and wouldn't normally be capitalised in a title, it is capitalised here because it starts a sentence.

aA Son A Son

We were playing ion the slide. We were playing on the slide.

We were playing ion the slide. We were playing on the slide.

A girl said that my niece looked like a baby boy. A girl said that my niece looked like a boy.

This is a little tricky. Unless you want to emphasise that the girl said your niece looked specifically like a male baby, you would usually just say "looked like a boy". This first instance might occur when you're talking about someone who is "baby-faced" and looks younger than they are. But otherwise, in most cases, you'd be talking about mixing up the genders. This is very picky though, so don't worry too much about it!

I told her that she had made a mistake. I told her that she had made a mistake.

I told her that she made awas mistaken. I told her that she was mistaken.

She then told me that she also had a baby sister. She then told me that she had a baby sister.

I asked her age, and she told me she was 5.5 and a half years old. I asked her age, and she told me she was 5 and a half years old.

In spoken English, kids often say they are "5 and a half years old", and it's typically written this way too. This is the only case I can think of when we write out "and a half" instead of using .5 as you have.

After soonSoon after, her grandma showed up with her sister, who was about nine months old. Soon after, her grandma showed up with her sister, who was about nine months old.

After soona little while, her grandma showed up with her sister, who was about nine months old. After a little while, her grandma showed up with her sister, who was about nine months old.

Or "soon after." Also consider that the second "her" is technically ambiguous in its reference to the girl or the grandma.

Minutes later, I saw a couple talking with the girl and asked her to gocome home. Minutes later, I saw a couple talking with the girl and asked her to come home.

I think you might mean "come home" here, but I could be wrong. "Go home" = the couple is staying in the square but has asked the child to go home without them. "Come home" = the couple is going home and has asked the child to come with them.

Minutes later, I saw a couple talking with the girl, and they asked her to go home. Minutes later, I saw a couple talking with the girl, and they asked her to go home.

I think they wanted a son, which they very much needed much. I think they wanted a son, which they very much needed.

I think they wanted a son, which they needed very much. I think they wanted a son, which they needed very much.

你可以多解释一下这里的“需要”吗，觉得意思不太清楚。

Because of thean ugly tradition. Because of an ugly tradition.

Because of the ugly tradition of favoring boys over girls. Because of the ugly tradition of favoring boys over girls.