I gave birth 8 days ago to DS2 and as the days went by he was feeding less and less. I took him to a breast feeding clinic and they have diagnosed tongue-tie. They have done a referral and it should be sorted out soon (around 2 weeks) and in the meantime I have been pumping and bottle feeding (he had lost over 15% at 1st way in but gained 150g in 2 days once I started pumping and bottle feeding) . I have done everything I can think of to increase my milk supply but I can barely keep up and wondered if I should keep a back up of formula in the house. I have heard that having a back up can make it to tempting to give up the pumping (it is a little exhausting) but I worry about running out of expressed breast milk. He still suckles a little at the breast with the aid of nipple shields but if he is really hungry he just screams for the bottle.