I agree with Nic - enjoy the time you have with them while they are little. Too soon they don't want to hang out with you anymore, and you are no longer the centre of their universe!

Let them make a mess sometimes (where appropriate - outside etc) play with water and get dirty! They will remember these times far more than how clean mummy kept the house!

Listen to them. It is really important to listen and hear your children. This will build trust and they will be more likely to turn to you when they have a serious problem when they are older.