Good features but upgrade after upgrade

I began using this app and liked how organized it was. It makes tracking as many or as few details possible. I have twins so I paid to upgrade to use for multiple kids. After a week or 2 I decided to sync with my another device for easier use the thing took 5+ hours to sync then only tracked one of the kids unless I would pay yet another upgrade fee of 5.99 ( original upgrade 1.99) so very unhelpful and time consuming to use on 2 devices and we are all busy and trying to take care of babies I dont have time for you to nickel and dime me :(

Twin-mom-85 about Feed Baby - Breastfeeding App, v2.5.1