I am surprised at how many people on here don't take their infants and children in for their well baby check ups and their yearly physicals.
I don't think you fully understand why they are so important.
Well baby check ups and physicals aren't just about vaccines, they are a way to establish a baseline for that child, their average height, weight, their normal skin color, temperature..etc and as they get older their normal blood work levels. This is very important because if these change even a little, it could save a child's life. You could easily have a healthy child today and a very sick child tomorrow, having that baseline can help determine what is wrong quicker because they can see exactly what is being effected.
Really this applies for every age, even as healthy adults we should be getting yearly physicals and blood work. My DH runs 1/2 marathons and is training for a full marathon. He eats well and exercises but at his last physical we discovered that his cholesterol was a little elevated and his blood pressure was also slightly elevated, this is genetics. Nothing to worry about right now because it is only barely elevated but he will keep an eye on it and if it starts to creep up they can put him on meds to lower it, thus preventing him from having a heart attack. Without these test we would assume that he is very healthy with nothing to worry about because of his lifestyle but that isn't always that case.
Please, take yourself and your children in for your check ups, it could save your lives!
This applies to dental and vision check ups as well.