Growth spurts are roughly 3monthly, but in toddler age they kind of vary, I just notice that he wants more food & offer it.
My ds#1 is 2.5, but he eats roughly what he did at one still.
Morning tea I give crumpets or raisin toast or fruit or crackers & cheese & a cup of milk (used to be a bottle then sippy, now open cup)
for afternoon tea he gets fruit we share 2 peices (more with dh on weekends) & crackers & occasionally he gets some cake or sweet biscuits & often has a milkshake or smoothy too
HTH