Aunque la pediatra dijo que estaba bien, la madre tendrá cuidado por si vuelve la rabieta.

Pediatra is one of those nouns that can refer to either a man or a woman without changing the ending. The article shows the gender:

• el pediatra = the male pediatrician
• la pediatra = the female pediatrician

So even though the noun ends in -a, it is not exclusively feminine.

Because the speaker is presenting what the pediatrician said as a real, accepted fact:

• Aunque la pediatra dijo que estaba bien...

With aunque, Spanish often uses:

• indicative when the information is presented as real or known
• subjunctive when it is hypothetical, uncertain, or not being asserted as true

Compare:

• Aunque dijo que estaba bien... = even though she said he/she was fine
• Aunque diga que está bien... = even if she says he/she is fine

So the indicative fits because this is about something that actually happened.

Here, estar bien means to be fine / okay, which is the normal expression for a person's condition.

• estaba bien = was fine / was okay

Why not the others?

• bueno usually means good, not fine in a health/wellbeing sense
• estuvo bien would sound more like a completed state or event, and is less natural here
• está bien would shift the reference to the present, while dijo puts us in the past

So dijo que estaba bien is the natural way to report that, at that time, the pediatrician said the child was okay.

The subject is not stated because Spanish often omits subject pronouns when the context makes them clear.

In this sentence, estaba bien most likely refers to the child or person being discussed. Spanish does not need to say él / ella if the listener already knows who is meant.

This is very common:

• Dijo que estaba cansado. = She said he/she was tired.
• Me dijeron que estaba todo bien. = They told me everything was fine.

So the missing subject is normal, not incomplete.

Tendrá cuidado is the simple future, and here it means she will be careful.

All of these are possible in Spanish, but they are slightly different in feel:

• tendrá cuidado = she will be careful
• va a tener cuidado = she is going to be careful
• tiene cuidado = she is careful / she takes care, which sounds more like a general habit

In this sentence, the mother is reacting to the situation and deciding what she will do from now on, so the future tense works well.

Tener cuidado means to be careful or to take care.

In this sentence, it means the mother will act cautiously because the tantrum might come back.

A few examples:

• Ten cuidado. = Be careful.
• Voy a tener cuidado. = I’m going to be careful.
• La madre tendrá cuidado. = The mother will be careful.

It is a very common expression in Spanish.

Por si means in case.

So:

• por si vuelve la rabieta = in case the tantrum comes back

It is not the same as plain si:

• si vuelve la rabieta = if the tantrum comes back
• por si vuelve la rabieta = in case the tantrum comes back

The difference is important:

• si introduces a condition
• por si expresses precaution against a possible event

A very common pattern in Spanish is:

• Lleva un paraguas por si llueve. = Take an umbrella in case it rains.

After por si, Spanish normally uses the present indicative, even when English uses a future idea:

• por si vuelve la rabieta
• por si llueve
• por si viene

This is one of those patterns you mostly have to learn as a structure.

So:

• por si vuelve = in case it comes back

Why not vuelva?
Because por si usually does not trigger the subjunctive.

Why not volverá?
Because Spanish usually prefers the present indicative here rather than the future.

Spanish often uses the definite article where English would use no article or would sound more general.

Here la rabieta refers to the tantrum as a known or identifiable event/state, something already understood in context.

So Spanish naturally says:

• vuelve la rabieta = the tantrum comes back / the tantrum returns

Using the article makes the noun sound more concrete and specific.

Both are possible, but vuelve la rabieta is very natural in Spanish.

With verbs like volver, llegar, aparecer, venir, Spanish often places the subject after the verb, especially when something is happening or reappearing:

• Llegó el médico.
• Vino tu hermano.
• Volvió la fiebre.
• Vuelve la rabieta.

This order gives a slight sense of the event occurring rather than emphasizing the subject itself.

So:

• vuelve la rabieta = natural, event-focused
• la rabieta vuelve = also possible, but with more emphasis on the tantrum

Yes. Rabieta is a very common word in Spain for a tantrum, especially a child’s tantrum.

It usually refers to an emotional outburst such as crying, yelling, stamping, refusing, and so on.

In Latin America, you may also hear other words, such as berrinche, but in Spain rabieta is very standard and natural.

Not with the same meaning.

• La madre tendrá cuidado por si vuelve la rabieta.
  = The mother will be careful in case the tantrum comes back.

This means she is taking precautions now because the tantrum might return.

If you said:

• La madre tendrá cuidado si vuelve la rabieta.

that would mean:

• The mother will be careful if the tantrum comes back.

That changes the timing and logic. It suggests she will only be careful at the moment the tantrum returns, not that she is already being cautious beforehand.

So por si is the better choice here.