Convinced someone snatched my son and replaced him with a clone. Two whole years my son has screamed…

Convinced someone snatched my son and replaced him with a clone. Two whole years my son has screamed and fought us on bath time like he was allergic to water or something. He'd fight so hard we'd end up with scratches, and one time a bloody nose from him flailing. But today I was filling up the tub because he needed a bath and left the door open while I grabbed a towel across the hall. His dad had him undressed and I see him just walk into the bathroom and climb into the tub by himself! He's always screamed bloody murder if we put him anywhere near the tub even if it was empty, his training potty is on the other side of the room because he won't set foot in about half of the bathroom. Now he's sitting in the tub, no tears, no whining, no screaming, quietly PLAYING in the tub with his toys and I have no clue who's child this is. He looks like mine, but he's not acting like mine at all! Hoping he keeps this up, I didn't know how bath time was going to go once I had a bigger belly on me.