complementary strand. noun, Biochemistry. 1. either of the two chains that make up a double helix of DNA, with corresponding positions on the two chains being composed of a pair of complementary bases. 2. a section of one nucleic acid chain that is bonded to another by a sequence of base pairs.
The teething process. Most babies start teething at around six months. However, all babies are different and the timing of teething varies. Some babies are born with their first teeth. Others start teething before they are four months old, and some after 12 months. Early teething should not cause a child any problems, unless it affects their feeding. A rough guide to the different stages of teething is:
When to Expect Teething to Begin. Most babies' teeth begin to erupt between the ages of 4 to 6 months, though for some it may be earlier or later, Dr. Josen says. And no matter what Grandma says, when your child's first tooth pops in, it has nothing to do with smarts.