pretty much this - breastmilk has natural laxative properties so formula fed babies tend to have more issues with constipation - so no direct experience here.While our kid hasn't had problems pooping yet, we've had multiple doctors tell us that there is absolutely nothing wrong if they go as little as only once or twice a week. As long as fluids are passing through them and they are urinating plenty, then they can go several days without a bowel movement and be fine. If you think about it, it kind of makes sense, babies are doing nothing but ingesting fluids.
of the folks I know who are formula feeding they sometimes have tried switching formulas if it gets to be an issue but I agree with Joeboo - its nerve wracking but I think you're ok/withing normal range.
Side note - we are reading happiest baby on the block and its doing a decent job helping. Author is egotistical but eh.
Baby gets real painful gas. If it does smell I don't notice -im so happy for him when he gets a good fart or explosive poop. Gripe water doesn't work, gas drops are hit or miss.....we are trying probiotic drops which are newer.....will report back. actually eya...maybe that will help you too?