Coming back to work after paternity leave is harder than expected

I've been back for two weeks and I feel depressed. Like genuinely sad during the day. I miss my kid so much and I feel like I'm missing all these moments. Plus I feel guilty for being relieved to get back to adult conversations. Is that normal? How do you guys handle the transition? I feel like I should be grateful for the job but instead I'm just resentful of the time away.