try to link the birthweight to each child
There is a file called a_natchild containing the information about the natural children including birth weight, gestational age, and breastfed.
There is another file called a_child containing information about child's identifier(pidp), childs age (a_dvage).
I had a hard time trying to link those two files together. a_natchild only provided a_childno, which is the birth order. But I don't know which kid that's apply for (e.g. pidp). Is the a_childno from a_natchild same as the a_childpno ? Do you have any suggestions about how to link the birthweight to each child? Many thanks