✅Answer: Please pay attention to the following narration:

1 فِی الْمَجَالِسِ وَ عُیُونِ الْأَخْبَارِ عَنْ مُحَمَّدِ بْنِ عَلِیٍّ مَاجِیلَوَیْهِ عَنْ عَلِیِّ بْنِ إِبْرَاهِیمَ عَنْ أَبِیهِ عَنِ الرَّیَّانِ بْنِ شَبِیبٍ قَالَ دَخَلْتُ عَلَی الرِّضَا فِی أَوَّلِ یَوْمٍ مِنَ الْمُحَرَّمِ فَقَالَ لِی یَا ابْنَ شَبِیبٍ أَ صَائِمٌ أَنْتَ فَقُلْتُ لَا فَقَالَ إِنَّ هَذَا الْیَوْمَ هُوَ الْیَوْمُ الَّذِی دَعَا فِیهِ زَکَرِیَّا رَبَّهُ فَقَالَ رَبِّ هَبْ لِی مِنْ لَدُنْکَ ذُرِّیَّةً طَیِّبَةً إِنَّکَ سَمِیعُ الدُّعاءِ فَاسْتَجَابَ اللَّهُ لَهُ وَ أَمَرَ الْمَلَائِکَةَ فَنَادَتْ زَکَرِیَّا وَ هُوَ قائِمٌ یُصَلِّی فِی الْمِحْرابِ أَنَّ اللَّهَ یُبَشِّرُکَ بِیَحْیی فَمَنْ صَامَ هَذَا الْیَوْمَ ثُمَّ دَعَا اللَّهَ عَزَّ وَ جَلَّ اسْتَجَابَ اللَّهُ عَزَّ وَ جَلَّ لَهُ کَمَا اسْتَجَابَ لِزَکَرِیَّا الْحَدِیثَ

📚 Uyoun Akhbar al-Ridha (peace be upon him) Vol. 1, p. 299

Translation: Rayyan ibn Shabib said: I entered upon Imam al-Ridha (peace be upon him) on the first day of Muharram. The Imam said: O son of Shabib, are you fasting? I said: No. He said: Today is the day that Zakariya (peace be upon him) called upon his Lord, the Almighty, and said: 'My Lord, grant me from Yourself a good offspring. Indeed, You are the Hearer of supplication.' So Allah answered him and commanded the angels to call out to Zakariya while he was praying in the 'mihrab': 'Indeed, Allah gives you good tidings of Yahya (John)';

So whoever fasts on this day and then calls upon Allah, the Almighty, Allah will answer him just as He answered Zakariya's prayer...

Explanation: As is clear from the phrase of the hadith, it includes all needs, and we can pray both for asking for a child and for other needs.

Suggestion: Insha'Allah, let's fast on the first day of Muharram and then pray for the 'faraj' (relief) of our master, peace be upon him.

اللَّهُمَّ فَصَلِّ عَلَی مُحَمَّدٍ وَ آلِ مُحَمَّدٍ وَ عَجِّلْ لِوَلِیِّکَ الْفَرَجَ وَ الْعَافِیَةَ وَ النَّصْرَ