They performed a secondary analysis of the Enquiring About Tolerance (EAT) trial, which was originally created to examine the effects of early food introduction on the development of food allergies.
Feeding babies solids from three months improves their sleep, according to a study that contradicts NHS advice.
"We believe the most likely explanation for our findings of improved sleep is that that these babies are less hungry" said Lack, adding that solid foods might mean less regurgitation or greater feelings of being full.
One group was encouraged to exclusively breastfeed for around six months.
The findings provide some solid data to back up the long-held belief that feeding infants solid food helps them sleep better, Dr Jae Kim, a neonatologist at of the University of California San Diego and the Radey Children's Hospital of San Diego, told Reuters Health in a phone interview.
The differences between the groups peaked at six months, with the group fed solids early sleeping for a quarter of an hour longer per night (almost two hours longer per week) and waking less frequently - 1.74 times a night rather than twice a night.
That report knocked away one of the main justifications for delayed introduction of solids, and past year health authorities in the USA changed their guidance by recommending the most at-risk children should be given peanuts as early as four months.
The new data come from the EAT study, which involved 1,303 infants and was created to investigate whether introducing solid foods earlier might help prevent food allergies. Early introduction of solids could cause harm in infants who aren't developmentally ready to chew and swallow, he explained, while starting solids can also lead to earlier weaning, reducing the benefits of breastfeeding.
One group was breastfed for six months while the other was given solid foods in addition to breast milk from the age of three months. "Given that infant sleep directly affects parental quality of life, even a small improvement can have important benefits".
Experts say women should still heed this recommendation, although it is under review.
She said: "These are interesting findings from a large randomised controlled trial". If there is any doubt about what's best for your baby, please seek advice from your doctor or health professional'.
The NHS and World Health Organization now advise to wait until around six months before introducing solid foods, but these guidelines are now under review.
"However, the evidence base for the existing advice on exclusive breastfeeding is over 10 years old, and is now being reviewed in the United Kingdom by the Scientific Advisory Committee on Nutrition".
Sarkisian, who is now the offensive coordinator for the Atlanta Falcons, sued USC for $30 million after he was sacked in 2015. Sarkisian first got into trouble at USC after he went on a "booze-filled rant" at a Salute To Troy event in August 2015.
While England's top football players were on the pitch, its top golfers were sitting at home watching the game unfold. And, specifically for the crowds back in England , it was a chance to fling all those pints of beer high overhead.
La medida llega luego de que Estados Unidos impusiera aranceles a bienes chinos por 34.000 millones de dólares el viernes pasado. A su juicio, el comercio internacional vive "un momento caótico" por las recientes decisiones del Gobierno estadounidense.
El pigmento encontrado en el suelo de Mauritania, África por una empresa extractora de petróleo, fue rosa brillante . En lugar de ello, podría ser porque no había alimento para que evolucionaran formas complejas de vida.
Americans quitting their jobs for better opportunities
Companies continue to fill more positions and as such, job openings dropped to 6.64 million in May, down from 6.84 million. Businesses are advertising 6.64 million available jobs in May, while there are only 6.1 million unemployed people.
England manager Gareth Southgate sparks waistcoat craze
But while Harry is less confident about England's chances, his brother Prince William appears to be more optimistic. Everyone has been out on the streets celebrating what we've achieved and that is a great source of pride for us.