Hi, my DD is 10 weeks old and we are mixed feeding breast and formula (aptamil.) shes currently taking 6oz but seems very unsettled on this, i want to move up an ounce but the box says they should only be on 7 ounces at 4 months old?? and stage 2 aptamil says you can only use while exclusively bottlefeeding (no breast) so ladies, what would you suggest? x