I forgot to add that Lucca has had his bottom two teeth in for a month or so, and they're these cute little baby teeth. A few days ago one of his top front teeth came in, and the other is about to break through. They are giant! Giant grown-up teeth. Poor little guy...
He is obsessed with standing up, wants to do it all the time, whether he's holding on to something stable or not. Hence he crashes on a regular basis, yet he persists.