Is the best part of marriage over?

I continually wonder... is the best part of marriage over? Like was the beginning the BEST part? The happiest of times? And now 5 years in, one baby in, and many awful arguments and verbal attack’s later.. it is what it is. Just trying to get by everyday without arguing and underlying resentment? Constantly getting defensive and annoyed with one another? Ugh. Is this how most marriages are? Wishing I could go back to times when we constantly had sex, laughed and made each other happy. The honeymoon days is what I crave.