Am I wrong

My wife went to give our 9 week old son a bath. We had been conversing and arguing for awhile and once we stopped she decided to give him a bath. As she was washing him she rested a washcloth on his chest which almost covered his privstes. I noticed he was looking up at her and smiling a bit. I thought it would be a good memory to capture. I took out my phone to take a picture and I was going to make sure not to get anything below his tummy. She freaked out and snatched the phone from me. She told me how wrong I was for doing that. How would I feel if a friend told me to strip down and they take a picture but it’s okay cause they wouldn’t get anything below the waist. Told me there is something wrong with me and that I’m not protecting our child. That he isn’t old enough to say no and how embarrassing it would be for him. Was I wrong? Is it not acceptable to take a photo of your little one enjoying their bath? I could understand the problem if I were sharing it or if there was any sort of nudity but I didn’t think I was doing wrong by my son. Am I wrong?