I forgot to mention this in my short updates that there was indeed flute version of AAAAAAAAAAAAAAAAAAA BGM played in one of the scenes
After Rishita's bus karidne ki pratigya, Chiku suddenly starts crying who is being held by Shweta. She acts as if she doesn't know how to pacify him. BhabiMa runs towards Chiku and Shweta but stops midway and realizes that Shweta is there to learn how to take care of Chiku and bond with him and urges her to pacify him.
That's when AAAAAAAAAAAAAAAA BGM plays,
If you notice, ever since this Chiku track started about a month ago, not an episode goes by without an AAAAAAAAAAA BGM, they use either the flute version or the voice and sometimes they use both the versions in the same episode đ