How Can I Regain my Youthful Baby Face After my Facelift

The short answer is that you may benefit from fillers or resurfacing procedures following a facelift.

Fillers  following a face lift makes perfect sense. This is because you age by three factors - sagging (through gravity and time), loss of volume (counteracted by fillers), and skin texture (determined by environmental and genetic factors). Your fillers should enhance your effect of the lifting if placed appropriately by addressing one of the causes of aging..Most often one of these factors are more out of balance than another and therefore your procedures should customize for what is most needed. Often fillers alone can "stall" the inevitable as they only correct one aspect of aging.
Facelift and Skin resurfacing procedures (laser, Ulthera or Thermage ) and fillers are synergistic so as long as you wait until the Sculptra injection site is soft you should do fine. Not a problem and there is no problem with the timing for a facelift. Sculptra, Radiesse, Jeuvederm, Restylane, fat transfer and other fillers address volume issues, resurfacing procedures corrects surface flaws associated with aging and face lifting addresses the sagging loose skin. Resurfacing procedures address skin texture, color variation (e.g. sun spots)- so all three are synergistic and complementary. It is very common in my practice to do all three approaches to rejuvenation at the same time

Although it is hard to tell without seeing your pictures what you are describing is likely related to volume loss and would be improved with facial fat grafting

  I usually advise that there are 3 factors to facial rejuvenation and that surgery to address issues caused by gravity addresses only one of the three.  It is also important to consider volume restoration and skin rejuvenation.  Your question concerns the former and this can be addressed with fat grafts, implants, sculptra, and other fillers.  Chances are help is available and that you will be satisfied with the results of volume augmentation.