Question????

Jennifer • My little girl will be five in July and is a huge big helper to her little brother that was born in March.
So I'm ebf and my almost 4 week old son was eating every 3 hours with a 4 to 6 hour span at night. Starting yesterday he started eating every 2 hours even through the night. Should I be worried he isn't getting enough and thats why he is eating more frequently or do you think he may just be going through a growth spurt?