In the USA, it depends on the State...
What Happens to the Remains of Aborted Babies?
"""These children are often treated as medical waste. But several states mandate cremation or burial. ""
“Without regulations, medical practitioners are free to dispose of human fetal remains by incineration with medical waste, by dumping in landfills, and even by burning the remains to generate energy,” a legal brief filed by Americans United for Life (AUL) notes.
Alabama, Arizona, Arkansas, Idaho, Indiana, Louisiana, North Carolina, North Dakota, Ohio, Oklahoma, Tennessee, Texas, and Utah all have laws on the books requiring that aborted babies be cremated or buried. "