Hi there.
I was at my grandfathers funeral 2 weeks ago.
It was a catholic ceremony.

I wore a nice skirt and top, and the kids wore their best clothes.
Dh wore a collared shirt and tie.

There were 3 children there under 2.5years (2 mine and 1 my sisters baby).
They would talk loudly every now and then and did yell out to my Dad when he went to the alter to say the ulogy.

To be honest no one gave us looks or anything but it was our grandfather and these were his only great grandchildren.

My Daughter even came up to me to give the thanks for the ceremony at the microphone.

However if it isnt a close family member i would still dress respectfully and i would stay near the back or exit point incase your bub gets upset and the family get upset if they cant hear the speeches etc.

xx