Jamieson, Fausset and Brown on Hosea 1:8

8. weaned--said to complete the symbolical picture, not having any special signification as to Israel [Henderson]. Israel was bereft of all the privileges which were as needful to them as milk is to infants (compare Psa 131:2; 1Pe 2:2) [Vatablus]. Israel was not suddenly, but gradually cast off; God bore with them with long-suffering, until they were incurable [Calvin]. But as it is not God, but Gomer who weans Lo-ruhamah, the weaning may imply the lust of Gomer, who was hardly weaned when she is again pregnant [Manger].