Küçük yeğenim düştü, ama dizine sadece biraz pamuk koyduk; ciddi bir şey yok.

Here küçük most naturally means little or young. So küçük yeğenim means my little/young nephew/niece.

In Turkish, adjectives come before the noun, just as they usually do in English:

• küçük yeğenim = my little nephew/niece

Depending on context, küçük can mean either small or young, but with family members it often suggests young.

Düştü is the simple past tense of düşmek (to fall), in the 3rd person singular:

• düşmek = to fall
• düştü = he/she fell

It matches küçük yeğenim, which is a third-person subject.

A quick comparison:

• düştüm = I fell
• düştün = you fell
• düştü = he/she/it fell
• düştük = we fell

Dizine breaks down like this:

• diz = knee
• dizi = his/her knee
• dizine = to/on his/her knee

So dizine contains:

1. a possessive ending
2. a dative ending

In this sentence, dizine ... pamuk koyduk means we put some cotton on his/her knee.

This is very natural in Turkish. With body parts, Turkish often uses a possessed form where English may not.

Because Turkish commonly treats body parts as belonging to someone in the grammar itself.

So instead of saying something closer to English like on the knee, Turkish often says something more like onto his/her knee:

• elini kaldırdı = he/she raised his/her hand
• başım ağrıyor = my head hurts
• dizine pamuk koyduk = we put cotton on his/her knee

Even when English does not always make the possession explicit, Turkish often does.

Koyduk is the simple past of koymak (to put/place) in the 1st person plural:

• koyduk = we put

So the speaker is including themself with someone else: maybe a parent, family member, or another adult who helped.

That is why the sentence says we put some cotton on the knee, not I put. If it were I put, it would be koydum.

Yes. Literally it means we put cotton, and in context it suggests a simple home treatment for a minor scrape or injury.

Depending on the situation, English might say:

• we put some cotton on it
• we cleaned it and put some cotton on the knee
• we just treated it lightly

So it is quite natural in Turkish, even if the exact wording may sound slightly different from typical English phrasing.

They do slightly different jobs:

• sadece = only / just
• biraz = a little / some

So:

• sadece biraz pamuk = just a little cotton / only a bit of cotton

Using both makes the injury sound minor and the treatment minimal, which fits the reassuring tone of the sentence.

Because ciddi bir şey yok is the natural Turkish way to say there’s nothing serious.

Breakdown:

• ciddi = serious
• bir şey = a thing / something
• yok = there is not / there isn’t

So literally it is:

• There is no serious thing

In natural English, that becomes:

• There’s nothing serious
• It’s nothing serious

If you said ciddi değil, that would mean it is not serious, which is also possible in some contexts, but ciddi bir şey yok is a very common reassuring expression.

Yok means there is not / there isn’t / absent / non-existent. It is the opposite of var (there is / there are).

Examples:

• Su var. = There is water.
• Su yok. = There is no water.
• Sorun yok. = No problem.
• Ciddi bir şey yok. = There’s nothing serious.

So in this sentence, yok is not a verb like English is not in the usual sense; it is part of the very common Turkish var/yok system for expressing existence or absence.

Yes, it is very natural.

Turkish often puts the main verb at the end of the clause:

• Küçük yeğenim düştü
• dizine sadece biraz pamuk koyduk
• ciddi bir şey yok

The sentence also moves from:

1. what happened
2. what was done
3. reassurance

That flow sounds very natural in Turkish conversation.

Yes. The -im ending already means my, so benim is not necessary.

• yeğen = niece/nephew
• yeğenim = my niece/nephew

You could say benim yeğenim for extra emphasis, but normally yeğenim is enough.