Sandy is 10 months old and potty trained since he was very young. When we were away for 2 weeks holiday in Asia this year, my best friend came over to look after Sandy. My best friend told me Sandy went around the apartment and peed wherever he wanted. It was hard to believe because we rarely had any accidents.
My fiance was in the US for 2 weeks recently and I noticed Sandy started to pee in every single corner of our apartment. His pee pad was clean, no spots for 2 days (we always change it once a day). Sometimes he'd look at me and pee right in front of my eyes...

I had to clean up everyday

He even peed on my trousers one day!
My fiance came back last Sunday and everything's back to normal. I haven't cleaned a pee spot since then!
Why is my baby doing that?