Another baby?!

So I have 3 children, ages 4, 2 and 1, during my pregnancy with my youngest I was adamant I didn’t want anymore babies, even considered having my tubes tied because that was how sure I was. However, over the past few months I keep having the feeling that our family isn’t complete and how I would love to have another baby. I’m not sure if this is because my baby isn’t a baby anymore and is walking around chasing her brothers and it’ll eventually pass, just need someone to tell my I’m crazy and to enjoy not having sleepless nights anymore 😂