During pregnancy and while my kids were babies/toddlers, my chanel woc served me the best. The long strap of the woc accommodated to my growing belly and then when I was carrying my babies/toddlers on one hip, since the woc laid flat against my body, it didn't lose shape when my kids kicked it or sat over it.
I had a chanel classic mini, classic m/l, boy, gst, a white Chanel seasonal tote and jumbo back then but I didn't wear it until my kids didn't want to be carried anymore because they would have smashed the boxy shape of it or spilled on it. I wore them but on date nights or my strolls through target by myself lol 😆.
I voted for white classic mini with handle because I could tell by your choices that you wanted white. Light color is not ideal with babies or toddlers due to stains and color transfer. But I voted based on what you'd enjoy or want later when the kids get older 😀. They will eventually get older and you'll wear it. I rarely wear my woc now but it was my staple when I had a diaper bag. Your diaper bag will also go from luxury/cute to practical backpack that's functional.
Congrats!