Am I in the wrong? Lol

A guy I’m talking to has a toddler plus a 5 month old. When we first starting talking, he only had the toddler & I also only had my toddler. We just reconnected & I hear he has a 5 month old a few days after talking through his Snapchat stories. So I was like “oh he has another baby now? Cool!” To myself. I too have another baby. I just told him today because I wanted to make sure he knows. Lol he literally is getting upset with me? He says “where is this secret baby” & I told him it wasn’t a secret, our babies just never came up in our conversations, but that’s why I’m telling him now. I also told him we haven’t talked in almost a year life happens. He says “whatever” 🙄 I feel like I’m in the wrong here… am I? I’m 23 he’s 27.