My 5 Week old little man

Tyler just had a big growth spurt, his cute little shoes don't fit anymore, or the newborn size sleepers, and I had to adjust his carseat, all in a time span of 2 days! One day they fit, and I could buckle him in, the next I couldn't :(
I'm so so sad. Is he really gonna grow this fast? Can't I keep him just like this a little longer?