【at full time】 —reaching the normal mass or dimension:

• 【At full time】 the fetus weighs from six and one-half to eight pounds.

Note: The expression does not correlate in meaning with the phrase full time—

1. the regular number of hours allotted to daily or weekly work:

• All the factories we visited were running full time.

2. (also: high time) time when smth. should be done at once:

• The vessel is going to pieces, and it is full time for all who can, to leave her.

【in the fullness of time】 —at the proper or destined time:

• 【In the fullness of time】 , your children and your in-laws become friends.