DS is about 4.5 months. I've been using the Bjorn just because I had saved it from DD. He loves it but it is so uncomfortable for me so I bought the Ergo since it gets such great reviews. DS hates the straps being in his face which keep him from looking around. Am I doing something wrong? He is a big boy so it's not a size issue. He's 19lbs and 27". I'm considering returning the ergo and getting one of the new bjorn carriers that have the waist strap. I just wanted to ask first because I know so many people love the Ergo. I use the carrier mostly when I go grocery shopping or to the mall, and when I walk to pick DD up from school. DS hates the stroller right now.