My advice for you is to wait. It is known to parents, but also in psychology literature, that the first year or so after the arrival of a baby is problematic (mildly put). Everyone in the family needs to find their new place, needs to learn their new roles and needs to adjust.
Many times, one or both parents feel they need to protect their boundries and make sure the new order doesn't change their lives too much.
Many times, each parent needs a different amount of time to adjust and get in touch with the new born baby.
Many times parents see differently the way the baby should be handled (should we let him cry sometimes, shouold we wake him up at certain times...)
Many times hormons talk (sorry - but it takes us time to recover from pregnancy and giving birth).
And many times everyone is just tired...
All of a sudden you need to agree on stuff you never dealt with before (baby nutrition, is it okay to "educate" a baby on his first year, do you take him out to certain places, do you leave him with other people and who should these other people be etc'), and you need to do that when you're exhausted, more busy than ever and fresh in this area. On top of that - all these decisions seem extremely important, as they involve your baby's well being.
Put all that together - how can you not fight?
Therefore, my advice for you is to take your time, remember it happens to many (many many) others, and realise that routine day-to-day life will eventually return and each of you will find your place.