This may not help at all, but I just stopped going to have ds weighed altogether. He had lots of wet and dirty nappies, was alert, happy, and I knew he was growing because he no longer would fit in a certain size of clothes. I am not suggesting that this is the approach that everyone should take, but my point is this: as first time mums there is advice (much of it contradictory) coming at you from literally everywhere - what you should be doing, what you shouldn't be doing, what your baby should be doing etc etc.
We have babies later than previous generations and often come from small families where our exposure to small children was very limited until we had our own.
Therefore, we lose sight of a very important aspect of parenting: instinct. You know your baby better than any manual, doctor, hv, friend, or other mother.
Which of the problems that you have identified are problems that YOU have noticed and which are ones that society is putting on you? You need to decide how you want to raise your child, taking account of information available to you about best practice, but not basing it on this.
Imagine if when you met your partner/spouse you had to first read countless manuals and listen to EVERY single person's opinion before you decided whether or not you should move forward, what you should eat, how you should talk to him/her, how much sex you should have, etc etc. In some cases the advice might be helpful or good, but alot of what you would hear would be irrelevant and possibly damaging.
It is not exactly the same, but there is an element that is similar - it is worthwhile listening to some advice, but you can't realistically live by it and also some of it is uninformed, misguided and not applicable to your particular relationship.
In a very roundabout way, what I am saying is you owe it to yourself to trust your judgement - make changes if you think that that IS the best way forward, but accept that your child is an individual and will NEVER do things exactly the way someone elses baby or the textbook baby does.