Pose and Posture
Babies and infants are not able to support themselves. Depending on their age and development they may be able to lift and support their heads, but even then it is not for long. For these reasons you need to develop poses the baby will be both safe and easily photographed in. Using a pillow to prop the baby is common practice, as is letting her lay on her back or play with her toes; you can then photograph the baby in her natural position.
Props
Use props two ways when photographing babies. Use stuffed animals or other items in the photo for the baby to play with or lay with. You can also use props as a way to attract the baby's attention and have the baby or infant look at the camera. A good trick is to have the baby's mom or father stand behind you calling his name. The baby will naturally look for the familiar voice, allowing you to get a picture of the baby looking towards your camera.
Camera Angle
You are able to position yourself much easier than a baby can. The less you move the baby around, the less agitated the baby or infant will become. When you get the baby or infant in a position she is comfortable in, then you can move around and photograph her from different angles to produce different pictures. Change the lens you are using to create different pictures that will also add to the number of effects and pictures from the shoot.
Lighting
If possible use natural or indirect lighting to photograph a baby or infant. If you want to use direct lighting to achieve a certain effect, consider having one of parents hold the baby. Babies and infants will naturally role around and move from the position you may want to keep them in if you are using direct light. Natural or indirect lighting will create a soft feel to your photo shoot.