I've just had to endure 15mins of my DS crying his eyes out in the car & no bloody wonder - his back was really hot & sweaty when I took him out if his car seat! 
He had no blanket on & the car wasn't too warm either.
It's not the first time I've taken him out the seat & thought he was a bit warm but that was he first time DS has really protested.
Anyone else found the Pebble to be very warm?? (Mine is the red one)