The boy was killed as Pakistani forces resorted to unprovoked firing in a "complete bizarre manner" towards civilian areas at Laliyal village in R S Pura, official sources said.
Nine others were injured in the overnight firing of whom condition of a woman was stated to be critical.
"Pakistan Rangers opened indiscriminate firing and mortar shellingon forward BoPs and civilian areas in several sub sectors along International Border (IB) in Jammu district overnight," a senior BSF officer said.
"In the firing and shelling, one BSF Jawan was martyred and another injured," officer said, adding that the BSF troops guarding IB were giving a befitting reply.
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The deceased jawan has been identified as Constable Susheel Kumar.
(REOPENS DEL-48)
BSF officers laid wreath at the mortal remains of the jawan Susheel Kumar, who was from Karukshetra in Haryana.
While, six-year-old boy Vicky Kumar died due to splinter injuries of a mortar shell in Lalyal-Garkhal belt of IB.
The child from a labourer family from Bihar has spent the night in bunker and as soon as he came out to play, the splinter hit him.
Jammu Deputy Commissioner Simrandeep Singh said that 30 cattle were also dead and 130 others were injured in the firing and shelling in various border hamlets in the district.
The Police and Civil authorities are assessing losses on account of the damage caused to the property in various villages along the IB in Jammu district, Deputy Commissioner added.
There is huge damage caused to the houses and other properties in the border hamlets, an official said.
Meanwhile, Pakistan Army today claimed that two people, including a minor girl, were killed in "unprovoked firing" by Indian troops.
Pakistan Army, in a statement, alleged that the Indian soldiers resorted to firing and shelling in Harpal, Pukhlian and Charwah sectors on the working boundary.