Xa iinyanga ezilishumi elinesithoba zokulinda zisala emva, kwaye kunye nabo kwinkqubo enzima yokunikezela, enokuba yinto enhle kunokuba ixhomeke kwaye icinezele umntwana wakho osana kuzalwa! Ngomama ngamnye, imizuzu yokuqala yomanyano kunye nomntwana ukhunjulwa ngobomi. Luhlobo luni lweentsapho ezi zinyana neenyawo zibukeka ngathi! Inomdla okhethekileyo kumtsha omtsha ubangela umbala wamehlo kwintsana. Abazali abaninzi bafuna ukususela kwiintsuku zokuqala ukukhetha ukuba ngubani umntwana wabo obonakala ngathi ngumbala welihlo.
Umbala wamehlo ezisanda kuzalwa usenokuhluka phakathi konyaka wokuqala wokuphila, kwaye ngamanye amaxesha ukuya kwithuba elide. Ukufikelela kwiinyanga ezintathu kwiimeko ezininzi, kubantwana, umbala wamehlo awuqinisekanga.
Umbala wamehlo ezisanda kuzalwa uxhomekeke kwi-pigment ye-melanin. Isixa se-pigment sinquma umbala we-iris yeso. Xa kukho i-melanin eninzi, umbala wamehlo uba mnyama, xa unganci-grey, uluhlaza okwesibhakabhaka okanye uhlaza. Kuzo zonke iintsana, umbala wamehlo ulingana-ongeyomfutho oyimpumputhe okanye obomvu obomvu. Oku kungenxa yokuba i-melanin ayikho kwi-iris yomntwana. Ukutshintsha kwimibala yamehlo kwiintsana kuqalwe xa kuqhutyelwa le pigment. Le nkqubo yokwenza imveliso ye-pigment melanin ixhomekeke ngqo kwiimpawu zomntu kunye nokuzalwa kwakhe. Ngokuqhelekileyo usana olusandul 'ukuzalwa lutshintsha umbala wamehlo eziliqela. Kule meko, uphuhliso lwe-melanin pigment lwenziwa kancane kancane, njengoko umntwana ekhula. Kwezinye iimeko, iris yeso izuza umbala wayo wokugqibela kuphela kwiminyaka emithathu ukuya emine. Ngoko ke, ukuba umbala wamehlo osanda kuzalwa ushintsha kulo nyaka, akukho nto iyingozi kulo.
Impembelelo kumbala wamehlo osanda kuzalwa unenkinga enjalo yobuntwana njengengxube. Esi sifo sihamba kunye ne-yellowing yeproteins, ngokubhekiselele kuyo, akunakwenzeka ukucacisa umbala wamehlo. I-jaundice kwiintsana zihlala zanele. Intsana yebindi ayifanelekanga kwaye ayikwazi ukuhlangabezana ngokukhawuleza nomsebenzi wayo ngokupheleleyo. Oku kubangela isikhumba esiphuzi somntwana kunye nobuninzi beeprotheni. Njengomthetho, i-jaundice idlula ngokwayo kwiintsuku ezimbalwa emva kokuzalwa. Kwaye inzuzo efanelekileyo yokulwa ne-jaundice yimisebe yelanga.
Ezinye izinto ezithandekayo malunga nombala wamehlo:
- Umbala oqhelekileyo wamehlo kwihlabathi unobuninzi, kunye nokugqithisa-okuluhlaza. Ngaphantsi kweepesenti ezimbini zabemi beplanethi yethu ngabanini bamehlo aluhlaza. Kwamanye amazwe ase-Asia naseMzantsi Melika, amehlo aluhlaza ayitholakali kubantu;
- Ngaphantsi kwepesenti enye yabantwana abasandul 'ukuzalwa bazalwa ngeprogram ebizwa ngokuthi i heterochromia. Oku kuthetha ukuba amehlo omntwana anemibala eyahlukileyo;
- Iimpawu zezofuzo zibona ukuba umbala wamehlo ezisanda kuzalwa ususwe ngokomthetho kaMendel. Umthetho uthi abazali abanamehlo amnyama, mhlawumbi kuya kuba nomntwana onamehlo amnyama. Kwabazali abanamehlo avulekileyo - inkunzi yamehlo ekhanyayo. Ukuba ngabazali banemibala eyahlukileyo, umbala weso losana luya kumela into ethile.
Akukho nkqonkqele ehlabathini inokukwazi ukuchaza kakuhle umbala amehlo entsana yakho esandula kuzalwa. Ngako oko, abazali banokuqiqa nje ngalo mbandela, okanye ulinde kude kube yimbonakalo yomntwana, kwaye umbala wamehlo uya kufumana umbala wokugqibela.