What you are describing sounds a lot like what many new mums go through, and it is worth knowing that emotional withdrawal and low interest in intimacy can sometimes be signs of postnatal depression or hormonal changes, not just tiredness. It might be good to bring this up with your doctor or even a polyclinic GP, just to rule things out and get some support. On one hand, some of this is genuinely normal adjustment to a huge life change, but on the other hand, if it feels persistent and unlike yourself, that is worth checking rather than waiting it out. You know yourself best, and getting a professional view early means you can get back to feeling like you sooner.