Matthew Poole and continuators on Jeremiah 29:6

6 Take ye wives, and beget sons and daughters, and take wives for your sons, and give your daughters to husbands, that they may bear sons and daughters, that ye may be increased there, and not diminished .

That is, be not uneasie in your minds, not resolving what to do, through the prophesies of the false Prophets, that tell you the Captivity shall be but two years, or at least very short▪ But do all things which you would do, if Babylon were to be your fixed habitation, (as it is like to be for seventy years, say the Prophets, what they please) Marry, and give, and take in Marriage, do whatsoever it becometh prudent men to do, who would accommodate themselves in a place, where they are like to abide, and preserve their Families, that they might not be utterly extinguished. The words must not be understood as a precept, obliging all in the Captivity to do every of these things, which it may be they were not all able to do, but as a counsel and advice not to forbear any thing of this nature, which they would do, if they did fully believe they were to abide in a place seventy years.