Looking for a bit of advice... Took my ten-day-old baby out for his first stroll in the carrycot attachment today and, living in Devon, it comprised entirely of hills. Going downhill, his head was so much lower than this body that he hated it, started crying then threw up a whole load of milk. There are these buttons on the side that look like they may be for adjusting the angle slightly, but I can't work out how to do it. Anyone got any advice?