Babies are at greater risk of injury in crashes. This is because babies' spines are developing and their heads are large for their bodies. In a crash, if your child is riding forward-facing, her spinal cord may stretch, which could result in serious injury or death. However, when your baby rides rear-facing in a child safety seat, her upper body — head, neck and spine — is cradled by the back of the child safety seat in the case of a frontal crash, which is the most common type of crash.

According to research studies, children up to 2 years of age who are placed in forward-facing child safety seats are significantly more likely to be seriously injured in a crash than same age children who are in rear-facing child safety seats.

The following are some important child safety seat tips for your baby:

• Your baby should remain rear-facing until she is 2 years of age or until she reaches the highest weight or height limit allowed by the manufacturer of her child safety seat. Some rear-facing child safety seats can accommodate children up to 35 pounds or more. Don't be concerned if your child's legs bend at the knees or touch the back seat of the car when rear-facing; this will not harm her feet or knees.
• Always put your infant in a rear-facing child safety seat in the back of your car. A baby riding in the front seat can be fatally injured by a passenger side air bag.
• The shoulder straps must be at or below your baby’s shoulders. Child safety seats have several pairs of harness slots so you can adjust the harness as your baby grows. Make sure you use the harness correctly by following these tips:
  • The harness must be snug so you cannot pinch a fold in the harness material after buckling in your baby.
  • The straps should lie flat in a straight line without sagging or twisting.
  • The top of the chest clip should be positioned at armpit level.
• Never put a blanket between your child and the harness straps, or underneath or behind her. For car travel, don't dress your infant in bulky outerwear; it can interfere with the tightness of the harness. Instead, place a warm blanket over your child and harness. 
• Your baby is getting too big for his rear-facing child safety seat when his head nears the top of the seat. There should be at least one inch between the top of your child’s head and the top of the rear-facing child safety seat.

Joie Every Stage- Ladybird

All features:

• Group 0+/1/2/3 car seat
• Suitable rearward facing from birth to 18kg/4 years
• Suitable forward facing from 9kg to 36kg/12 years
• 5 recline positions: 2 rear facing and 4 forward facing for tilt options at every age
• Side impact protection provdes added security for the head, body and hips
• Guard Surround Safety™ panels provide extra side protection and can be individually activated for extra room in vehicle
• Reinforced steel inner seat shell increases structural integrity
• AutoAdjust™ side wings widen as headrest is raised to accomodate growing children
• One-hand, 10 position height adjustable headrest
• Grow Together™ multi-height headrest and harness system adjust simultaneously and require no re-threading of harness
• Custom Harness Hideaway compartments store the 5-point harness when using as a Group 2 booster
• Grow-with-me infant body and head supprt are customisable for an ultimate fit at every stage
• Plush, deluxe cushioning and fabrics keep little ones cosy
• Built in side ventilation
• Side, mesh storage pockets for child's must-have travel items
• Well marked, colour-coded installation paths
• Dual lock-offs for installing with vehicle's 3-point seat belt
• 5-point harness with soft, padded covers keeps baby cosy and secure
• One pull motion easily tightens the 5 point harness

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(Source from: http://www.chop.edu/centers-programs/car-seat-safety-kids/car-seat-safety-by-age/newborn-2-years)