La dentizione rende il bambino nervoso.

Dentizione means teething: the process of a baby’s teeth coming in.

It is a correct and fairly standard word, especially in medical, parenting, or explanatory contexts. In everyday speech, Italians may also talk about i denti che spuntano, mettere i denti, or similar expressions, depending on the situation.

In this sentence, la dentizione is a general noun meaning teething as a process.

Italian often uses the definite article where English would not.

So:

• La dentizione = teething / the teething process

Even when speaking in a general sense, Italian commonly includes the article:

• La pazienza è importante = Patience is important
• La musica mi piace = I like music

So La dentizione rende il bambino nervoso is completely natural Italian.

Here rende means makes or causes to become.

It comes from the verb rendere, which often means:

• to make
• to render
• to cause someone/something to become

So:

• rendere il bambino nervoso = to make the child nervous

Very similar patterns:

• Questo lavoro mi rende stanco = This job makes me tired
• La notizia lo rende felice = The news makes him happy

Italian can sometimes use both fare and rendere in meanings related to making, but they are not used in exactly the same way.

In this sentence, rendere + object + adjective is a very common structure:

• rendere qualcuno nervoso
• rendere qualcuno felice
• rendere qualcosa difficile

You may also hear fare innervosire or other alternatives, but rendere is especially neat and natural when followed by an adjective describing the result.

So:

• La dentizione rende il bambino nervoso = very natural
• literally: Teething makes the child nervous

Because Italian is using the pattern:

subject + verb + object + adjective

So the sentence breaks down like this:

• La dentizione = subject
• rende = verb
• il bambino = direct object
• nervoso = adjective describing the object

In English, we do the same thing:

• Teething makes the child nervous

The child is the one being made nervous, so il bambino comes right after the verb.

Because nervoso is an adjective describing il bambino.

The structure is:

• rendere qualcuno + adjective
• to make someone + adjective

So:

• rende il bambino nervoso = makes the child nervous

You would not use nervosamente here, because that is an adverb meaning nervously, and adverbs describe how an action is done, not the resulting state of the child.

Compare:

• Il bambino è nervoso = The child is nervous
• Il bambino parla nervosamente = The child speaks nervously

Because it agrees with il bambino, which is masculine singular.

Agreement here works like this:

• il bambino nervoso = masculine singular
• la bambina nervosa = feminine singular
• i bambini nervosi = masculine plural
• le bambine nervose = feminine plural

So if you changed the noun, the adjective would change too:

• La dentizione rende la bambina nervosa
• La dentizione rende i bambini nervosi

Literally, bambino is masculine singular and can mean:

• boy
• child
• baby, depending on context

In many contexts, especially general statements, masculine forms in Italian can be used generically. So il bambino here can often be understood as the child rather than specifically the boy.

If you wanted to be clearly feminine, you would say:

• La dentizione rende la bambina nervosa

Rende is third person singular present indicative of rendere.

So it means:

• it makes
• it renders

Here the subject is la dentizione, which is singular, so the verb is singular too:

• la dentizione rende

If the subject were plural, the verb would change:

• I dolori della dentizione rendono il bambino nervoso = Teething pains make the child nervous

Not in standard Italian. That sounds unnatural.

With fare, Italian usually does not say fare qualcuno/aggettivo in this way. Instead, common options are:

• rendere qualcuno nervoso
• fare innervosire qualcuno
• innervosire qualcuno

For example:

• La dentizione rende il bambino nervoso
• La dentizione fa innervosire il bambino
• La dentizione innervosisce il bambino

Of these, your original sentence with rende is simple and very idiomatic.

Yes, but the basic version is the most neutral:

• La dentizione rende il bambino nervoso.

Italian can sometimes move elements for emphasis, but not every change sounds equally natural.

For example:

• Il bambino è reso nervoso dalla dentizione = grammatically possible, but more passive and less natural in everyday speech
• Nervoso, la dentizione rende il bambino = possible only in very marked or poetic language, not normal conversation

So for ordinary use, the original order is best.

It is very close to English in structure:

• La dentizione = Teething
• rende = makes
• il bambino = the child
• nervoso = nervous

So almost word-for-word:

• Teething makes the child nervous

This is a good example of a sentence that is grammatically Italian but still maps quite neatly onto English.