I started combo-feeding my son shortly after getting home from the hospital. My supply couldn't keep up with my hungry boy, and I just wanted to ensure he was getting enough food! We started using Simlac 360 Total Care because we happened to have it on hand as a welcome gift, and it was supposed to be close to breastmilk. I noticed my son seemed to strain when trying to poop, and I felt like it wasn't normal. His pediatrician said it was, but I felt terrible for him. He was gassy, spitting up, struggling to poop(I mean going days without pooping and screaming when he needed to), and he was up every two hours. As a first-time mom, I realized some of this was normal, but I couldn't help but wonder what would happen if I did switch his formula. After his one-month checkup and seeing ads all over my Instagram feed, I figured I'd give ByHeart a shot, and they happen to sell it at my local Target! After THREE days, I noticed that my baby only woke up once a night! That was already a win for me. Then by the two-week mark, I noticed he was pooping more regularly and less gassy. Second win! Now we are on month TWO of using ByHeart and solely formula feeding. He's happy and healthy, and I've switched to the subscription, so I don't have to make as many trips to the store. However, knowing that if I ever run out early, I can swing by Target is lovely!