For people with pending I751 - bring your spouse to the interview, even if you received N400 notice with only your name on it.
I have my interview in early July ( N400 notice with only my name, still I751 pending). I was planning to come with my spouse just in case, but my kid woke up sick so I went alone in the end. I got check in ok, but when I was called for the interview the officer asked if my spouse is with me. He was not thrilled that I am alone, but understanding about the situation. I had birth certificate for my child ( born after I applied for N400) and some photos printed and he said it was enough. The whole interview/civic test process took maybe 15 min. I had an oath the same day.