Finally good news.
ILR has been approved.
I am sharing my timeline below:
I and my newborn bay have applied SET (P) application on 15 october 2018 by post.
It was received by HO on 16th oct.
I received acknowledgement by email on 31th October, 2018 and
received BRP letter on 1st November, 2018. We have done our BRP on 3rd of November 2018.
Home office has sent a standard email on 30th November 2018 stating their time frame.
Received ILR confirmation letter on 2nd of January, 2019. The letter was issued on 27th of December 2018.
Now time to apply travel document for me and register my child as a British citizen. Wish all of you will get a good result.