asa kara nani mo tabete inai kodomo ha kawaisou desu.

You’re right: in normal Japanese, this would usually be written as:

朝から何も食べていない子供はかわいそうです。

The spaces are just there to help learners see the parts more easily. Natural Japanese writing normally does not separate words with spaces.

から means from / since.

So 朝から means since morning or from the morning onward.

In this sentence, it sets the starting point for the situation:

• 朝から何も食べていない = hasn’t eaten anything since morning

With a negative verb, 何も often means not anything or nothing.

So:

• 何も食べていない = hasn’t eaten anything

This is a very common pattern:

• 何もない = there’s nothing
• 何も分からない = I don’t understand anything
• 何も食べない = eat nothing / don’t eat anything

Here, も replaces what English speakers might expect to be を, because the expression 何も + negative verb is a set pattern.

Here it means has not eaten.

The form 食べている can describe an ongoing state or a resulting condition, and in negative form 食べていない often means that the action has not happened up to now.

So in this sentence:

• 朝から何も食べていない = hasn’t eaten anything since morning

If you translated it as isn’t eating, that would miss the idea of up to now.

Because 食べない and 食べていない are different.

• 食べない = does not eat / will not eat
• 食べていない = has not eaten / is not eating

In this sentence, the speaker is talking about the child’s condition up to the present time. The child has gone without food since morning, so 食べていない is the natural choice.

Because Japanese uses relative clauses before nouns.

So:

• 食べていない子供 = the child who has not eaten

Japanese does not need a word like who or that here.

The whole phrase:

• 朝から何も食べていない子供

means:

• the child who hasn’t eaten anything since morning

That’s just how Japanese relative clauses work.

In English, you say:

• the child who hasn’t eaten anything since morning

In Japanese, you put the descriptive clause directly before the noun:

• 朝から何も食べていない子供

No の, no who, and no that are needed.

は marks the topic of the sentence.

So the topic is:

• 朝から何も食べていない子供 = the child who hasn’t eaten anything since morning

Then the speaker comments about that topic:

• かわいそうです = is pitiful / I feel sorry for them

So the sentence structure is basically:

• As for the child who hasn’t eaten anything since morning, that’s sad / I feel sorry for them.

Because かわいそう is a na-adjective.

When a na-adjective comes before a noun, it takes な:

• かわいそうな子供 = a pitiful child

But when it is used as the predicate at the end of the sentence, you do not use な:

• 子供はかわいそうです = The child is pitiful / I feel sorry for the child

So:

• before a noun: かわいそうな
• at the end of a sentence: かわいそうです

It usually expresses sympathy.

In English, depending on context, it can be:

• poor child
• I feel sorry for the child
• the child is pitiful

It does not just mean the child is “cute” or “weak.” It means the speaker feels that the child is in a sad, unfortunate, or pitiable situation.

It can be either, because Japanese nouns usually do not show singular vs. plural by themselves.

So 子供 can mean:

• a child
• children

In this sentence, context decides. In many cases, English would naturally translate it as the child or the children, depending on the situation.