I've made plenty of mistakes as a mom. And I hesitate to give advice because of those mistakes, and because I've received so much unwanted advice as a mother of young children (I first typed "young mother," but that brings to mind someone much younger than myself). But there is at least one thing I've learned about babies: there's always a reason.
If your normally happy baby is screaming, there's a reason (and it's not because she's trying to ruin your day or your sleep). You might not know that reason at the time, but I've almost always later discovered what was upsetting a baby or changing her schedule or any other unexpected and unexplained thing that babies do.
I do have to remind myself of this from time to time. Like when my one year old (who I was about to try to wean) suddenly starts waking up every hour or two to feed at night again. Or she is so needy and demanding to breastfeed so often during the day that my corresponding soreness if reminiscent of the early days of breastfeeding (seriously, I thought I was done with that). Cutting a tooth? An earache? A growth spurt? Fighting a mild bug? Maybe even a combination. But there is a reason and she's too young to try to make me miserable on purpose.
So my reluctant advice to myself and anyone else struggling with unexplained neediness of their baby (or even child) is that there is a good reason. And they'll eventually get over it. Right?