Этот соус слишком острый для детей, поэтому им лучше есть лапшу без него.

Because соус is a masculine singular noun in the nominative case.

Russian this changes form depending on the gender, number, and case of the noun:

• этот = masculine singular
• эта = feminine singular
• это = neuter singular
• эти = plural

So:

• этот соус = this sauce
• эта лапша = this noodles / this noodle dish

Here этот matches соус, which is masculine.

It can mean both, depending on context.

The adjective острый has several related meanings, including:

• sharp (a sharp knife)
• pointed
• spicy / hot (food)

In this sentence, because it is describing соус and talking about children eating it, острый clearly means spicy.

So:

• острый нож = a sharp knife
• острый соус = a spicy sauce

Слишком means too or overly.

So:

• острый = spicy
• слишком острый = too spicy

It works much like English too in too spicy for children.

Other examples:

• слишком холодно = too cold
• слишком дорого = too expensive
• слишком поздно = too late

Для requires the genitive case, so дети changes to детей.

• dictionary form: дети = children
• after для: для детей = for children

This is a very common pattern:

• для мамы = for mom
• для друга = for a friend
• для детей = for children

So Этот соус слишком острый для детей literally means This sauce is too spicy for children.

Russian has two common words here:

• ребёнок = child
• дети = children

But дети is not a regular plural of ребёнок. It is an irregular suppletive plural, meaning Russian uses a different root in the plural.

So the forms are:

• singular: ребёнок
• plural: дети
• genitive plural: детей
• dative plural: детям

This is just something you have to learn as a set of related forms.

Поэтому means therefore, so, or that’s why.

It connects the first idea with the result:

• Этот соус слишком острый для детей, поэтому...
• This sauce is too spicy for children, so...

In Russian, поэтому often appears near the beginning of the second clause, just as it does here.

You could think of the structure as:

1. statement: the sauce is too spicy for children
2. consequence: therefore, they should eat noodles without it

Им is the dative plural form of они (they).

• они = they
• им = to them / for them

In Russian, when you say that something is better for someone to do, you often use:

• кому-то лучше + infinitive

So:

• им лучше есть = it is better for them to eat

This sounds very natural in Russian. It does not literally mean they better eat in a harsh or threatening English sense. It is more like:

• they’d better eat
• it would be better for them to eat

Because лучше + infinitive is one very common way to express advice or what is preferable.

Here:

• им лучше есть лапшу без него
• literally: to them, it is better to eat noodles without it
• natural English: they’d better eat noodles without it / it would be better for them to eat noodles without it

Russian often expresses advice this way rather than using a direct equivalent of should.

Compare:

• Тебе лучше отдохнуть. = You’d better rest.
• Нам лучше уйти. = We’d better leave.

So this construction is worth learning as a standard pattern:

• dative pronoun/noun + лучше + infinitive

Because after лучше Russian normally uses the infinitive, not a conjugated verb.

So:

• им лучше есть = it’s better for them to eat

If you said едят, that would be a finite verb meaning they eat / are eating, which would not fit this structure.

Also, есть here is the imperfective infinitive, which is natural when talking about eating in a general sense, not about one completed act.

Because лапша is the direct object of есть (to eat), so it goes into the accusative case.

• nominative: лапша
• accusative: лапшу

This happens because лапша is a feminine noun ending in -а:

• лапша → лапшу
• вода → воду
• книга → книгу

So:

• есть лапшу = to eat noodles

Because без requires the genitive case, and the genitive form of он is него.

So:

• он = he / it
• него = of him / of it / without him / without it

Since соус is masculine, него here means it, referring back to the sauce:

• без него = without it

Why not его?
After many prepositions, Russian personal pronouns beginning with a vowel take an extra н-:

• у него = by him / at his place
• для него = for him
• без него = without him / without it

This is a standard pronoun pattern after prepositions.

Yes. In Russian, the same third-person pronoun forms are used for:

• he
• she
• it

depending on the gender of the noun they refer to.

Since соус is a masculine noun, Russian uses the same pronoun forms as for he:

• он = he / it
• его / него
• ему
• им
• etc.

So in this sentence, без него means without it, not without him, because it refers to соус.

Russian, like English, often uses a pronoun to avoid repeating a noun.

So both are possible:

• есть лапшу без него = eat noodles without it
• есть лапшу без соуса = eat noodles without sauce / without the sauce

Using без него sounds natural because the sauce was just mentioned in the first clause. It makes the sentence flow more smoothly.

The neutral word order here is very natural:

• Этот соус слишком острый для детей, поэтому им лучше есть лапшу без него.

Russian word order is more flexible than English, because case endings show grammatical relationships. So some parts can move for emphasis.

For example, you might also hear variations like:

• Поэтому детям лучше есть лапшу без него.
• Им поэтому лучше есть лапшу без него.

But the original version is clear and standard.

A useful way to read it is in chunks:

• Этот соус = this sauce
• слишком острый для детей = too spicy for children
• поэтому = therefore / so
• им лучше есть = it’s better for them to eat
• лапшу без него = noodles without it

Often, yes.

Russian лапша is usually a singular mass noun, while English often uses the plural noodles.

So:

• есть лапшу = to eat noodles
• куриная лапша = chicken noodle dish / chicken noodles

This is similar to how some nouns are singular in one language but plural in another. So even though English says noodles, Russian often uses singular лапша.

No. Here для детей with слишком острый clearly means too spicy for children in the sense of unsuitable for children.

The structure is:

• слишком [adjective] для кого-то
• too [adjective] for someone

Examples:

• слишком тяжёлый для меня = too heavy for me
• слишком сложный для студентов = too difficult for students
• слишком острый для детей = too spicy for children

So для детей here means for children / from the children’s point of view, not made for children.