Some details regarding the mubaarak birth of Rasulullah (sallallahu alaihi wasallam)

Q: It will be appreciated if you can clarity and confirm the authenticity of the following:

1. Rasulullah (sallallahu alaihi wasallam) was extracted from the womb of Bibi Aamina in a sajdah posture.

2. Sand particles were found in the mubaarak fingers of Rasulullah (sallallahu alaihi wasallam) upon his birth.

3. For moments on end his eyes were focused to the sky meaning to Allah.

4. His shahada finger was lifted.

Did all this happen on Rasulullah's (sallallahu alaihi wasallam) birth?

It's being quoted that historians have recorded the above. Guidance on the above will be appreciated.

Eating halaal and wholesome food

Q: I try to feed my family healthy with treats occasionally, but I have to force them to eat their veggies etc. My son sneaks to make savories or sweets/crisps or he will just not eat at all. He told me that I must remember sickness comes from ALLAH even if he eats these things.

Is this acceptable that I'm doing this or should I be more lax in this regard as long as they are eating halaal? He is 11 years old doing hifz.

Sitting for tashahhud in the first rakaat of Zuhr Salaah and making sajdah sahw

Q:

1. I was reading 4 rakaats fardh of Zuhr Salaah. After the first rakaat, I sat down and started reading tashahhud. I realised my error, but I completed the tashahhud, stood up and after the second rakaat did the tashahhud again and completed the rest of my salaah as normal. I did a sajdah sahw at the end, but I didn't recite the tasbeeh in the sajdahs. Is my salaah valid?

2. Previously, I was also reading 4 rakaat fardh of another salaah. In the second rakaat, after reading Surah Fatiha, I untied my hands to go in ruku. I quickly realised my mistake, tied my hands again and read a surah and continued the rest of the salaah as normal. Was I meant to read sajdah sahw in this situation?

Dua to be recited by the newly wed spouses on the first night

Q: I would like to know about the prayer that the bridegroom and bride pray together after nikah and before consuming their marriage. How is it performed and why? I will be getting married soon and have heard about this from an old person and he has not been able to give me more details. All the others to whom I have asked, no one knows about it.