Of course God gives all kinds of general laws that also have exceptions to them. It is simple: Hierarchy. Some laws take precedence over other laws in Scripture. Jesus taught us this when he said that there are weighter matters of the law, some sins are greater than other sins, and when he spoke of the two laws concerning love. People are to love God with all of their heart, mind, soul and strength, forst and then love their neighbors as themselves. Love for God is a higher law than love for neighbor. And of course, as most people recognize herein, the laws to oeby government have exceptions to them like whenb a government tells you to do something forbidden by Scripture, or forbids you to do something commanded by scripture. So yes, the Bible is full of commands and exceptions all throughout the Bible.
Ahhh, I think I see, you're coming from what many term as a "quiver full" mentality or position..... i.e. if people use wisdom under God's doctrine of stewardship to plan for their families (including the use of medical technology) that it is not holy, am I reading that right?
As for the last comment, well it all depends upon what theology you adopt regarding God's sovereignty. The positions are: (1) God is sovereign over every single detail of the universe through his active and passive decrees which includes miracles and natural laws that yield to his sovereignty whenever he so pleases, (2) God is partially sovereign over the entire universe and he interacts sovereignly through miracles which cannot be prevented or altered by anything in the universe, (3) God is limited in his sovereignty by man and can be thwarted by man and other elements and thus fail at some plans unless there is some miraculous intervention by God, (4) God is limited both in general rule and in his miraculous intervention by man or other elements in the universe, (5) God governs the universe through natural laws and processes and does not get involved, (6) God is learning and growing just like we are.
Depending upon one's position there it will determine one's answer on children as well as salvation.
I clearly embrace the absolute omnipotence, omniscient, omnipresent, omnibenevolent view that produces the view that God absolutely does govern then both children and salvation. Thus position one is where I stand yet even those in position two can still come to the same conclusions regarding children and salvation. Scripture speaks of this type of sovereignty in many verses but here are just a few: Gen. 50:20; Exodus 14:16-17; Joshua 11:20; Judges 9:22-24; 1 Sam. 2:25; Lamentatyions 3:37; Dan.4:34-35; Psalm 33:13-15; 139:16; Job 14:5; Jer. 10:23; Prov. 16:1,9; Matt. 11:27; 22:14; John 6:44; Acts 2:23; 13:48; Rom. 9:11-22; 11:7-10; Gal. 1:15; 2 Thess. 2:11-12; 1 Peter 2:7-8.