I have a 4 month old daughter who up till recently has been generally contented. For 2 weeks I have been giving formula milk once a day and intend to increase in preperation for when I go back to work in March. Started solids a week ago on suggestion from health visitor. My little girl in the last few days has been extremely irritable and has longer periods of crying. My instinct tells me her tummy hurts, she is definitely doing less dirty nappies then when I solely breastfed. What can I do feeling guilty and tired.