hello, by baby girl is 12 and half weeks old and has been breast fed so far. However in the last fews days my milk supply has cut down so much and I have no idea why! Now she wants to be fed every 1-2 hours whereas before it was 3-4. She wanted to be fed almost constantly yesterday, i ended up topping her up with formula as my boobs were totally empty! has anyone else had this problem? Should I persevere or switch her to formula? Help!