If your wife isn’t breastfeeding get several different brands of bottles. Your kid may have trouble with one kind but no others.
Get a 5Kg sack of potatoes or rice and practice holding it like a baby for at least 10-15 min several times a day. Get those baby holding muscles building now, just remember you want endurance not actual strength.
A white noise generator is good for when they are fussy and can calm them down.