The Buddhist ceremony on the southern island of Phuket concluded a week of funeral rites for baby Natalie, who was hanged from the side of an abandoned building on Monday by her 20-year-old father Wuttisan Wongtalay.
Wuttisan, who hanged himself shortly after, filmed the macabre scene using his phone and broadcast it on Facebook Live.
The video was seen by Natalie's 22-year-old mother and hundreds of thousands of others before it was taken down some 24 hours later, prompting calls for Facebook to move more swiftly to block graphic content.
Her tiny body was swaddled in pink, red and white cloth before it was lowered into the ground alongside a collection of her favourite toys and pillows.
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Natalie's mother, Jiranuch Trirat, scattered yellow chrysanthemum flowers over the body before other relatives piled dirt back into the grave next to the Phuket temple.
"I feel better now that she's resting," Jiranuch told AFP after concluding the ceremony.
The gruesome video was the latest violent crime broadcast on Facebook Live, triggering a renewed debate over the handling of such content and provoking anger among some social media users who said the company was too slow to spot and remove the clip.
"I forgive him because holding onto anger for a long time will not get my daughter back," she said.