If you are not a US citizen, you need to adopt the child and then to possess custody of the child for 2 years (as far as I remember). Then the child can come here on H-4 or a derivative green card.
FAQ's Updated on 21 September 2015
Discussed: FAQ Dual intent visas and filing green Card in multiple categories simultaneously, CSPA, Denial of F-1 student visa, FAQ: H-1 Receiving payments for past work/bonus (1099), change of location H-1B amendment, AC21 green card portability, naturalization, J-1 waiver, H-4 EAD: travel, fingerprinting, reentry permit
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See clip from Attorney Rajiv S. Khanna's conference call video that addresses this question.
We discussed: Working concurrently with H-1 cap exempt and quota employers, immigration issues if we have a special needs (cerebral palsy) child, applied B-2 to main status while F-1 is expiring, Section 245(k) and illegal work, DETAILED DISCUSSION OF I-140 REVOCATION IMPLICATIONS INCLUDING AC21, impact on H-1 of reentry on advance parole, Section 13 green card for diplomats, who can co-sponsor affidavit of support I-864, proving cross chargeability, transfer of priority dates for a future job approval