By 6 to 7 months, his nutritional needs can no longer be filled by milk alone and the inclusion of nutrient-dense foods  are a must. It becomes hugely apparent that capitalizing on the window between 5 and 6 months to prime his palate with a wide variety of healthy savoury flavors pays dividends . To be able to hit the ground running at 6 to 7 months with him already accepting these nutritious foods will ensure his nutrient needs to optimize growth and development are met. Adequate nutrition to optimize growth and development will not come from apple puree and infant cereal!  Although milk remains an important component of his diet, so do nutrient-rich foods, high in iron  and zinc, and balanced in good sources of fats , proteins , and carbohydrates .
Good sources of proteins and carbohydrates [26, 27] Although both essential for overall health, they must be in balance. A diet too high in protein has shown a tendency for a more rapid weight gain (and propensity to obesity), and a diet too reliant on carbohydrates as the dominant energy source can be nutrient poor, especially if they are highly refined or over-processed.
Initially, until he gets the hang of it, he will only need one ‘meal’ a day. Mid to late morning or mid-afternoon are often good times to start. The morning milk feed is often his biggest feed of the day, so we don’t want to compromise this. Try and feed him roughly an hour after the first morning feed. This will give him time to process the milk, but be content enough to try a new experience. He has not yet made the connection that solid foods will satisfy hunger so he will be less accepting of solids if he is frantically hungry.
It is important to make an infant’s introduction and first experiences surrounding food an enjoyable experience, so choose a time that is free of stress for both you and baby.
Remember, eating is a sensory experience, so when it suits, sit him up to the family table at mealtimes. He will feel included and be more likely try new foods if he sees the family eat them. 
Meat, poultry, fish, and eggs are all excellent sources of protein. Milk and milk products as well as pulses, legumes, and soy are also good sources of protein, however, milk should not be introduced as a drink before one year as this can interfere with iron uptake, and/or take the place of more nutrient-dense milk options (breast milk or formula, which is specifically manufactured to deliver nutrient needs). It is OK to use small amounts of full-fat milk in food preparation. Caution must also be applied when relying too heavily on pulses and legumes to meet protein needs. They are high in fiber, which is a good thing, but too much fiber can irritate an immature gut and provide too much bulk, limiting tiny tummies to other, more nutrient-dense  options.
During the first years of life, an infant’s diet undergoes its biggest change from an exclusively liquid diet to one with a variety of complementary foods in addition to milk. This transition is necessary to support his increasing nutrient requirements, and to prepare for the cessation of breastfeeding or infant formula feeding. During this transition, an infant’s renal and gastrointestinal function must undergo significant change and maturation in order to process non-milk foods. So establishing a healthy microbiome in the gut is essential for the digestion and metabolism of food.
Infancy is a critical time as this is when an individual lays down the blueprint for how food is metabolized. Given the rise in metabolic disorders (obesity, diabetes, cardiovascular disease), this early stage of life is the prime opportunity to build a healthy microbiome, which in turn builds a robust immune system and enables the production of neurotransmitters that affect behaviour and cognitive function.
Probiotics are living microorganisms, the ‘good bacteria’ that live in our gut.
The colonization of the gut with microorganisms occurs naturally through the birth process (vaginal delivery), drinking breast milk, and everyday contact with the outside world. However, with the rise of cesarean sections (disrupting the transfer of beneficial microbiota from mother to infant), declining rates of breastfeeding (another source of beneficial microbiota), and the proliferation of antibiotic use (which can destroy the beneficial microbiota), many infants are on the back foot in terms of microbiome colonization. If this is the case, and given the importance probiotics play in overall health and wellbeing , a supplemental probiotic may be beneficial.
Prebiotics are a type of fiber that the human body cannot digest. They serve as food for probiotics. In the newborn, both probiotics  and prebiotics are transferred through breast milk. On receiving solid foods these prebiotics are provided through vegetables and fruits.
Generally, by 5 to 6 months reflux starts to improve as the gastrointestinal tract starts to mature. Sometimes, starting him on solids can actually help with reflux. However, to start off with you might want to avoid highly acidic foods such as citrus and tomato. Here are some more tips for a baby prone to reflux:
Today, few pediatricians recommend that parents start with infant cereal. Dr. Frank Greer, former chair of the American Academy of Pediatrics (AAP), encourages parents to stay away from infant cereals. Here’s why:
Some straining during pooping is OK. However, if coupled with the following symptoms, it might pay to have it checked out with your pediatrician.
Providing there are no underlying causes, constipation can be quickly turned around without medical intervention. Here are some things to keep in mind:
You may notice a change in his stools when he starts solids. It is quite normal for them to change in color, consistency, and even smell. Typically stools will become more solid and stronger in odor. Peas and other green vegetables can result in green-colored stools while beets can make them red. Stools may also contain undigested pieces of food. This is normal as the immature gut needs time before it can fully process these new foods. If the stools are extremely watery or full of mucous, it may mean the digestive system is irritated. Try cutting back on the amount of solids but ensure he is still receiving the milk feeds. If it continues, consult with your pediatrician.
In order for him to be able to digest cereals and grains he needs to make use of enzymes he produces to break these down to release nutrients. However, the particular enzyme he requires, pancreatic amylase, is not produced until the second half of his first year (6 to 12 months). Although there will be no drastic effect (in most children) in introducing grains before this enzyme is present, it will mean that the nutrients from the grains may not be well absorbed. Undigested product can also begin to irritate an immature digestive system, effecting the balance of bacteria and microbiota . Therefore, the general consensus is to wait until at least 6 months before incorporating small amounts of cereals/grains, preferably wholegrain, [87, 89] into his diet. It is also important to offer a nutritionally dense  diet of varied flavors and textures to train healthy eating habits , and to limit highly refined and processed foods .
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Disclaimer: The information provided is the opinion of Good Feeding, it has not been evaluated by healthcare professionals, and is for educational purposes only. Before starting any new foods or feeding practices, please consult your baby's healthcare professional.