Breast Feed, vacinate and dont leave baby unattended, talk to baby and stimulate baby's intellect (the use of senses are important as the brain is still in development) by like reading to baby and allowing the baby to explore. Do not keep the baby over clean like an OCD parent germs and dirt help build the immune system. A study shows that children with pets are a stronger immune system however be sensible about it. If the pet has parasites sort it out. (an article source:
http://articles.chicagotribune.com/...0120808_1_dog-ownership-ear-infections-babies . however there are numerous studies on this). Falling and putting everything in their mouths are a babies way of sensing the world and understanding and learning, if its not hazardous do not stop this process.
Do not give any medication to a baby without consulting a medical practioner/pharmacist because medicines have bad effects later in a child and they require special medications. DO NOT MISE ON this, it will cost you more later fixing the damage when you try to be a smartass even if you think its a simple thing, you dont want to stop the development of your child's bowels by giving the baby lomitil/immodium for example. If its given by a specialist paed (and no one else should have a say on this not GP not pharmacist) then only, this effect is irreversable so always consult i cannot stress this point enough.
finally dont drop the baby on the head. There you should be fine
when they todlers: let them play and get exercise, CONTROL their diet so you dont get this:
http://img43.imageshack.us/img43/3337/fatkidk.jpg
dont rush to ritalin if the child has more energy than you can handle being a parent is hard work so work. (see klaping point below)
finally remember, children arent born with knowledge they learn from trial and error in early stages and the example you set.
Good action = reward
bad action = punishment. A proper klap, not the "ima ground you bull" because eventually the kid will challlenge for authourity and this wont work. You will end up with a kid thats suffering from pseudomental illness or being emo or whatever because you were too afraid to parent properly. Nobody likes to smack kids (well normal people) but its necessary - obviously do not publicily humiliate a child but a private klout will go further than any words possible. Human beings arent born they are taught by parents, its a simple trait of mammals. As much as we like to think we arent animals the hard truth is we are and follow natures laws.
There you cant go wrong now.
EDIT:
Keep diet as natural as possible. Learn to make your own baby food from scratch if possible. The quality of food you provide the child is very important to how the GIT will develop and function and also ensure decent development all around. Nobody likes a GIT in bad shape, ask anyone with IBS
All of this starts IN the WOMB. If mummy has poor diet then baby's health will be poor. You can have the best genetics in the world but if mummy didnt provide the building blocks you cant build jack. DNA is a blueprint - you still need materials