How can I help my two week old child sleep better?

Consistency. Consistent bedtime routines, even at this young age, will help your newborn sleep better as an older baby and toddler. Many parents find a warm bath, massage, songs, rocking and feeding are good bedtime routines. Try to start the routine around the same time each evening. It takes practice but eventually your little one will come to expect this and will associate this with going to bed easily.
Sleep plan. Babies learned to sleep long before they were born but have no memory of sleeping. If you begin to set up a simple sleep plan, you may survive the next three years with fewer hard nights.