Worst Mom in the World!

Dear Dain,
Today I feel like the worst mom in the world.  I feel so stupid when it comes to all the new things you need as you grow.  I thought I was doing so well and that you were happy, healthy, and getting everything you needed...until today.
Daddy and I have been trying to figure out the whole solid food and formula thing since you started eating solid food almost two months ago.  In the beginning, it was relatively easy because you didn't eat a lot of the solid food so you were still eating your normal bottles.  Recently, you've begun to eat nearly a whole jar (4oz!) of food or more at each of your 3 solid food feedings a day and so, Daddy and I thought if you ate less than a whole jar we should make up the difference between that and 5 oz with formula (eg. if you ate 3 oz of food, we gave you 2 oz formula).  We also thought if you ate a whole jar of food that you didn't need any formula.  Of course, we knew that you needed liquids so you didn't dehydrate, so we were giving you water with your meal. 
I've been really concerned about doing this because I've noticed a change in your mood lately.  So, I called the doctor's office today to make sure we were doing the right thing.  Turns out, your supposed to get 20-30oz of formula in addition to whatever you want to take of your solid foods.  The nurse told me that you could either eat the formula (a whole bottle if you wanted!) after or while you were eating your food or that we could give you water with your food and then feed you a whole bottle as a snack between solid feedings.  The last couple of days you've been averaging only about 15 oz of formula at most!  I feel so horrible.  All this time when you got whiny, I thought it was either because you were bored, your gums were hurting, or you were tired.  And I was wondering why you seemed so much more tired than normal...you haven't been getting the nutrition you need!  How did I not know this?!?
I am so sorry baby boy.  I try so hard to make sure that you are well taken care of and that you have everything you need and want.  You are everything to me.  I feel so terribly that you've been trying to tell me you were hungry and I didn't know.  I vow to do better from here on out...and if I'm not sure about something, I will bug the doctors instead of assuming I know what I'm doing.
Please forgive me.  I can't wait for you to level out again and your demeanor to get back to normal.  You're such a happy, sweet boy.
I love you so very much!

Love,
Mommy