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:
Get help from a doctor now âº. 4-8 months: Most infants start teething between 4-8 months of age. There is a very wide range of what is normal. I have seen several infants born with bottom front teeth already and many who didn't get their first tooth till 9-14 months old. In almost all cases it just works it own way out as the child grows.