Hi,
In my understanding and observation, I’m also inclined to think your child’s birth-chart shows afflictions to Ascendent or Udaya Lagna and Lagna Lord Jupiter/Guru-dev indicating a weak physical/physiological constitution, 2nd house (Zodiac sign of Aries or Mesha Rashi), 2nd lord of Speech Mars/Kuja, 3rd house/lord of Communication, Karaka for Communiction Mercury/Budha and 6th lord of Roga-Sthana. The current Maha-Dasha is that of 3rd & 8th lord (is not a benefic), posited in the Lunar Constellation of Chitta Nakshatra, ruled by 2nd lord Mars/Kuja, activating him, along with Rahu, Mercury/Budha, Moon/Chandra.
For the records, Ascendent or Udaya Lagna, 2nd lord Mars/Kuja and Sun/Ravi all occupy Sarpa Drekkana. Saturn/Shani-dev and Ketu’s aspect of Udaya Lagna and Mars/Kuja is not preferred. 2nd house of Speech is caught in a strong Papakartari Yoga, Rahu has below par Vimsopaka Bala and occupies the 3rd house of Communication and hosts Mercury/Budha in his Lunar Constellation of Swati Nakshatra. Lagna Lord Jupiter/Guru-dev and 6th lord Sun/Ravi participate in Sukshma Parivarthana at Nakshatra level. Ascendent or Udaya Lagna, Moon/Chandra, Lagna Lord Jupiter/Guru-dev and 2nd lord Mars/Kuja are all placed in mute signs.
All these seem to have contributed to the issue. All said and done, I’m inclined to think birth-time is off by a couple of minutes and the child started his life in the Antara of Roga-Karaka Sun/Ravi, who might have activated Saturn/Shani-dev, making the issue a bit of a chronic one.
As for remedies, please consider offering special prayers to the Shriman Lakshmi NarayanaSwamy (combination of Goddess Maha-Lakshmi and Shriman Narayana – doing so will help appease Maha-Dasha lord Venus/Shukra and Mercury/Budha) along with Navagrahas, chanting/reading and making the child hear Shriman Vishnu Sahasranama at least twice daily.
Apart from that, it would help for you checking the following Mantra (the mantras are said to be very powerful, when done with right intent/intensity). Here are the mantras:
1) Om Vad Vad Vaag vaadini Swaaha (108 times)
2) Om Vaag vaadinyaiya Namaha (108 times)