unfortunately you have to e-file without that dependent.  After about a month then you must amend dependent's return(first) and then amend this return to claim the dependent.  You may be able to amend electronically according to posts I have seen here but not until at least August-but I am not a betting man-might be easier tho slower to paper amend.  Amend dependent's return, place in a #10 envelope, label envelope 2019, and write PROCESS FIRST.  Amend this return claiming dependent, put in a separate #10 envelope labeled 2019, and write PROCESS SECOND.  Then place both envelopes in a 9X13 envelope/folder and mail to IRS processing  center.