My goats share pens in family groups (5ft x 8ft, max 3 aqdults per pen), but everyone goes out together most of the time (some pregnant ladies may have separate grazing sessions to make sure no butting etc from the bossy and this year non-pregnant goats occurs). Kids stay with their dams until 4 days, after which they will go on the bottle and I milk twice a day. Initially they have a part of the (kidding) pen sectioned off and once taking the bottle well, mum will rejoin her family group and all the kis will share a pen. I don't let mine out until about 6 weeks old or so, as a) they have to go into the same field as mums and I do not want them to start to suckle again and b) by then they are well used to eating greenery (as well as milk).
Everybody is shut in at nighttime, so no issues with foxes etc here, although both foxes and badgers do a nightly patrol through the paddock (footprints in mud!).
My fencing is sheepnetting with top electric wire, and the kids normally test it a couple of times, and then no issues anymore. I have used horse tape to subdivide the field, but kids were then about 5 months old. After one test they respect it well. But it will need a fairly low tape (to make sure no wriggling under) and then again one to make sure no stepping across bottom tape, plus one as high as possible. Mine are pretty docile though... the other day I let them out, came back from school run (about 30 mins) and saw that the bottom gate (easy access to road. but minor) was wide open... goats hadn't even noticed....