That growth spurt

Ta

So I’ve been reading about a growth spurt and I’m sitting here like what? I have an 8 and 5 year old and I do not remember anything about this growth spurt. Well my 5 week old started giving me a rough time last night going to sleep. He did good during the night it’s just when he is awake. He is so fussy and constantly wants to eat which I’m not sure is normal. He is bottle fed by the way. I have tried to lay him down a few times already today and he wakes up 5 min later. This sound like the growth spurt right?