Because of its importance, feeding holds a special place in the infant‘s development landscape. However, even though feeding a priori appears as being firmly rooted in physiology, it is finally more fragile than it seems. Recent epidemiological studies show that 25 % to 35 % of infants in regular pediatric clinic are subject to restrictive feeding difficulties. For some infants and young children (2%), these difficulties can become larger and turn into eating disorder. In line with the studies of both Donald Wood Winnicott (1975) and Gianna Williams (1997), contemporary psychoanalysis can provide with a fruitful reading grid, complementary to the existing pediatric and psychoanalytic theories in perinatality. With the aim of meeting such challenges, this article is divided into two parts. First part of this article is devoted to recent searches carried out in psychoanalytic perinatal clinic in relation with the co-influence and co-excitation issues which are linked to infant’ eating disorders. Second part includes clinical recommendations. The combination of psychoanalytic paradigms and of infant's observation techniques allows to recall the interests of articulating the intrapsychic and intersubjective dimensions in order to understand infant's feeding. Similarly, the psychosomatic aspect of the disorder is discussed throughout the article.