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 the process by which an infant's first teeth (the deciduous teeth, often called baby teeth or milk teeth) sequentially appear by emerging through the gums, typically arriving in pairs. Teething usually begins between six and eight months. It can take several years for all 20 teeth to complete the tooth eruption.