I had a baby in 2021 how do i get her stimulus check?

Yes you should get the Recovery rebate credit for a baby born in 2021.  See IRS question 8

2021 Recovery Rebate Credit — Topic C: Eligibility for claiming a Recovery Rebate Credit on a 2021 tax return | Internal Revenue Service

Be sure you said the new baby lived with you the WHOLE YEAR!  Go back and check that under My Info.  Maybe delete the baby and re add him

If you had a child born in 2021- Add them under My Info. You need to answer 2 questions…..

Did your child live with you for the whole year? Answer YES even if they were born late in the year (even on Dec 31).

Then was at least half of child's expenses paid by CHILD? Usually is NO.

If you qualify the 1,400 Recovery rebate credit will be on line 30 and either increase a refund or reduce a tax due.

You also should get the Child Tax Credit 3,600 for them on line 28.

Which box is checked at the top of 1040 for your child?  If the Child Tax Credit box isn't checked you answered something wrong.  Try deleting the baby and re enter him under My Info.

Before filing,  You can preview the 1040 or print the whole return

https://ttlc.intuit.com/community/accessing/help/how-do-i-preview-my-turbotax-online-return-before-filing/00/26160