Ребёнок нарисовал ромашку в альбоме.

Ребёнок is in the nominative case because it is the subject of the sentence — the person/thing doing the action.

• ребёнок = the child
• It answers the question who drew?
• The answer is ребёнок

So the basic structure is:

• Ребёнок = subject
• нарисовал = verb
• ромашку = direct object
• в альбоме = location

Нарисовал is the past tense, singular, masculine form of нарисовать.

It tells you:

• the action happened in the past
• the subject is grammatically masculine singular
• the action is viewed as completed

Russian past-tense verbs agree with the subject in gender and number:

• нарисовал = masculine singular
• нарисовала = feminine singular
• нарисовало = neuter singular
• нарисовали = plural

Because ребёнок is grammatically masculine, the verb appears as нарисовал.

This is a very common Russian aspect question.

• нарисовал is perfective
• рисовал is imperfective

Here, нарисовал means the child drew and finished the drawing. The result matters: there is now a daisy drawn in the album.

By contrast, рисовал would focus more on the process, repeated action, or an unfinished situation:

• Ребёнок рисовал ромашку = The child was drawing / used to draw a daisy.

So in your sentence, нарисовал suggests a completed drawing.

Because ромашку is the accusative singular form of ромашка.

• ромашка = nominative singular
• ромашку = accusative singular

It changes because it is the direct object — the thing that was drawn.

For many feminine nouns ending in -а, the accusative singular ends in -у:

• книга → книгу
• машина → машину
• ромашка → ромашку

So:

• Что нарисовал ребёнок?
• Ромашку.

Because в here means in, and it is expressing location.

When в means in/inside and answers where?, Russian usually uses the prepositional case.

• dictionary form: альбом
• prepositional singular: в альбоме

So в альбоме means in the album / in the sketchbook.

This is the difference between location and motion.

• в альбоме = in the album → location → prepositional
• в альбом = into the album → direction/movement → accusative

Compare:

• Ребёнок нарисовал ромашку в альбоме.
  The daisy was drawn in the album.

• Ребёнок положил рисунок в альбом.
  The child put the drawing into the album.

So in your sentence, no movement into the album is happening; it is just the place where the drawing is.

Russian does not have articles like English a/an and the.

So:

• ребёнок can mean a child or the child
• ромашку can mean a daisy or the daisy
• в альбоме can mean in an album or in the album

The exact meaning depends on context.

Russian can add other words if it wants to be more specific, for example:

• этот ребёнок = this child
• тот альбом = that album
• какой-то ребёнок = some child

But normally, Russian simply leaves articles out.

Yes. Russian word order is fairly flexible because case endings show each word’s role.

Your sentence has a very neutral order:

• Ребёнок нарисовал ромашку в альбоме.

But you could also say:

• В альбоме ребёнок нарисовал ромашку.
  Emphasis on where

• Ромашку ребёнок нарисовал в альбоме.
  Emphasis on what

• Нарисовал ребёнок ромашку в альбоме.
  Less neutral; sounds more marked or stylistic

So the meaning stays basically the same, but the focus changes.

Because в альбоме means the drawing is inside the album / on its pages.

Using на would usually mean on the surface of the album, such as on the cover:

• в альбоме = in the album, in its pages
• на альбоме = on the album

So if a child drew on a page inside a sketchbook, в альбоме is the natural choice.

Yes. Ё shows the sound yo and it is normally stressed.

So:

• ребёнок is pronounced roughly rye-BYOH-nak

In many printed texts, Russians often write е instead of ё, so you may see:

• ребенок

But it is still understood and pronounced as ребёнок.

This is something learners should get used to: ё is very important for pronunciation, even though it is often omitted in writing.

The stress is:

• ребёнок
• нарисовал
• ромашку
• альбоме

So the sentence is pronounced approximately like this:

• reb-YO-nok na-ri-sa-VAL ra-MA-shku v al-BO-mye

Knowing the stress matters because Russian vowel pronunciation changes a lot when syllables are unstressed.