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:
Teething is relatively painless for many children. The first tooth can come in anytime between 3 to 15 months, with an average age of 4 to 7 months for most infants. If teething does cause symptoms, it is usually about 4 days before and until 3 days after the tooth comes in. Don't blame serious symptoms, especially a high fever or irritability, on teething. Don't overuse teething gels and teething tablets, since they shouldn't be needed for the average teething child.