Nicotine, which is the main drug in tobacco products, is the number one used drug in the U.S. Many people do not consider nicotine to be a drug, however it is. Nicotine is highly addictive and has the properties of both a stimulant and a sedative.
Your baby will probably be able to lift her head when she's about a month old, and hold it up when placed in a sitting position at around 4 months. Her neck muscles and head control should be strong and steady by 6 months.
As you continue to progress through your pregnancy, the positioning of your baby becomes a very important factor to consider. When you are 30 weeks pregnant, your baby should be in a cephalic (head down) position. Unfortunately, this is not the case for at least 25% of expectant mothers. Even so, it is normal for a baby to turn their head at 34 weeks. It should be of concern only if your baby does not turn their head after the 36 week mark.