Arguing after baby

I feel like me and my husband have hit rock bottom ever since the baby has been born. We have been arguing more and over little things. Such as I feel like he doesn’t share enough with me, I feel less confident that’s why I do not agree with his WhatsApp group which occasionally has exchanges of porn as it irritates me, also I get really upset with sometimes his attitude. We are planning a get away next month so we can work on our relationship, but I just want to know how can I start healing the bad patches because we argue more, we have less sex and we are very direct with our feelings and opinions