Custody..

When parents split up or two people accidentally get pregnant and decide they want to parent together...

What do you think is the BEST custody arrangement specifically for the child. Lets say the child is being breastfeed but the mother would pump and provide milk if they wanted to continue.
Also why do you think it's the best.

What would be best, if the parents could live under the same roof I guess, not as a couple if they dont want to be, but just to be civil.

Otherwise 2 days mum, and 2 days dad, that way neither parent has to be away from the child for too long and they both get weekends at some point.

If it's an infant then I wouldn't want the baby away from momma at all until at least 6 months & then after that for short times & not overnight until after a year (and for me I wouldn't agree to it until weaned & in my state as long as dad has good access, they will delay overnights with a nursing child until age 3). That is just my personal opinion based on what I know of human attachment & the security babies feel when with mom - especially nursing babies - because they do know momma is the source of food.

Ideally you do what is best for the child & I do not think overnights away from mom are good for infants, at all, no matter who they are with.

This explains it better than I could ever... http://www.drmomma.org/2010/07/mother-toddler-separation.html

While breastfeeding I think the mother should get more time. It's crucial to their development at that point, and fathers can't provide everything that mothers can in those early stages.