I know every baby is different, but why does my 6 mo old eat more than my 4.11 yo?

[babypowder]

We only started solids on Tuesday, but DD2 is eating like she's been waiting for it all her life. She's had asparagus, broccoli, sweet potato, new potatoes, a bit of nectarine, bowls of porridge (yes, the spoon was used) and tonight has just polished off a dry baby weetabix.

DD1, on the other hand, ate 2 bites of sausage and 4 pieces of pasta tonight, followed by 6 strawberries.

Something's not quite right, here!